Are you fully updated? Checked if your mirror was synced before updating? Any plugins in use from outside sources in vlc?
Might be needed to post your /var/log/pacman.log from the last week or so.
Yes, I think so and afaik no.
Here is the content of /var/log/pacman.conf of last 2 weeks:
[2014-10-25 10:38] [PACMAN] synchronizing package lists
[2014-10-25 10:38] [PACMAN] starting full system upgrade
[2014-10-25 22:33] [PACMAN] Running 'pacman -Syu'
[2014-10-25 22:33] [PACMAN] synchronizing package lists
[2014-10-25 22:33] [PACMAN] starting full system upgrade
[2014-10-25 22:37] [PACMAN] removed python2-pycurl (7.19.0.2-1)
[2014-10-25 22:37] [PACMAN] upgraded blender (2.72.1-1 -> 2.72.2-1)
[2014-10-25 22:37] [PACMAN] upgraded btrfs-progs (3.16.2-1 -> 3.17-1)
[2014-10-25 22:37] [PACMAN] upgraded dhcpcd (6.5.0-1 -> 6.5.1-1)
[2014-10-25 22:37] [PACMAN] upgraded filezilla (3.9.0.5-1 -> 3.9.0.6-1)
[2014-10-25 22:37] [PACMAN] upgraded iw (3.14-1 -> 3.17-1)
[2014-10-25 22:37] [PACMAN] upgraded pycups (1.9.63-1 -> 1.9.68-1)
[2014-10-25 22:37] [PACMAN] upgraded pysmbc (1.0.13-2 -> 1.0.15.3-1)
[2014-10-25 22:37] [PACMAN] installed python3-pycurl (7.19.5-1)
[2014-10-25 22:37] [PACMAN] installed python3-cairo (1.10.0-2)
[2014-10-25 22:37] [PACMAN] installed python2-gobject3 (3.12.2-1)
[2014-10-25 22:37] [PACMAN] installed python3-gobject3 (3.12.2-2)
[2014-10-25 22:37] [PACMAN] upgraded system-config-printer (1.4.4-1 -> 1.5.3-1)
[2014-10-25 22:37] [PACMAN] upgraded kdeadmin-print-manager (4.14.2-1 -> 4.14.2-2)
[2014-10-25 22:37] [PACMAN] upgraded libaio (0.3.109-1 -> 0.3.110-1)
[2014-10-25 22:37] [PACMAN] upgraded libical (1.0-2 -> 1.0.1-1)
[2014-10-25 22:37] [PACMAN] upgraded libpurple (2.10.9-2 -> 2.10.10-1)
[2014-10-25 22:37] [PACMAN] upgraded libxkbcommon (0.4.3-1 -> 0.5.0-1)
[2014-10-25 22:37] [PACMAN] upgraded linux-firmware (20140829-1 -> 20141009-1)
[2014-10-25 22:37] [PACMAN] upgraded media-player-info (21-3 -> 22-1)
[2014-10-25 22:37] [PACMAN] upgraded mkvtoolnix (7.2.0-2 -> 7.3.0-1)
[2014-10-25 22:37] [PACMAN] upgraded oxygen-gtk2 (1.4.5-1 -> 1.4.6-1)
[2014-10-25 22:37] [PACMAN] upgraded oxygen-gtk3 (1.4.0-1 -> 1.4.1-1)
[2014-10-25 22:37] [PACMAN] upgraded python2-setuptools (6.1-1 -> 7.0-1)
[2014-10-25 22:37] [PACMAN] upgraded python3-setuptools (6.1-1 -> 7.0-1)
[2014-10-25 22:37] [PACMAN] upgraded qbittorrent (3.1.10.1-1 -> 3.1.11.1-1)
[2014-10-25 22:37] [PACMAN] upgraded v4l-utils (1.4.0-1 -> 1.6.0-1)
[2014-10-27 12:15] [PACMAN] Running 'pacman -Syu'
[2014-10-27 12:15] [PACMAN] synchronizing package lists
[2014-10-27 12:15] [PACMAN] starting full system upgrade
[2014-10-27 12:31] [PACMAN] upgraded firefox (33.0-1 -> 33.0.1-1)
[2014-10-27 12:31] [PACMAN] upgraded krb5 (1.12.2-1 -> 1.13-1)
[2014-10-27 12:31] [PACMAN] upgraded libotr (4.0.0-2 -> 4.1.0-1)
[2014-10-27 12:31] [PACMAN] upgraded libxml2 (2.9.1-2 -> 2.9.2-1)
[2014-10-27 12:31] [PACMAN] upgraded octopi (0.4.82-1 -> 0.4.83-1)
[2014-10-27 12:31] [PACMAN] upgraded python2-pillow (2.6.0-1 -> 2.6.1-1)
[2014-10-27 12:31] [PACMAN] upgraded samba (4.1.12-1 -> 4.1.13-1)
[2014-10-27 12:31] [PACMAN] upgraded tzdata (2014h-1 -> 2014i-1)
[2014-10-27 12:31] [PACMAN] upgraded usbutils (007-2 -> 008-1)
[2014-10-29 10:05] [PACMAN] Running 'pacman -Syu'
[2014-10-29 10:05] [PACMAN] synchronizing package lists
[2014-10-29 10:05] [PACMAN] starting full system upgrade
[2014-10-29 10:07] [PACMAN] upgraded firefox (33.0.1-1 -> 33.0.2-1)
[2014-10-29 10:07] [ALPM-SCRIPTLET] To have better integration with KaOS
[2014-10-29 10:07] [ALPM-SCRIPTLET] Select Use GTK+ theme, this will follow your KDE settings
[2014-10-29 10:07] [ALPM-SCRIPTLET] Or download and use the KaOS.crx:
[2014-10-29 10:07] [ALPM-SCRIPTLET] http://sourceforge.net/projects/kaosx/files/sources/chrome-themes/KaOS.crx
[2014-10-29 10:07] [ALPM-SCRIPTLET] This google-chrome theme follows the KaOS color scheme and look
[2014-10-29 10:07] [PACMAN] upgraded google-chrome (40.0.2194.2-1 -> 40.0.2202.3-1)
[2014-10-30 12:10] [PACMAN] Running 'pacman -Syu'
[2014-10-30 12:10] [PACMAN] synchronizing package lists
[2014-10-30 12:10] [PACMAN] starting full system upgrade
[2014-11-01 00:34] [PACMAN] Running 'pacman -Syu'
[2014-11-01 00:34] [PACMAN] synchronizing package lists
[2014-11-01 00:34] [PACMAN] starting full system upgrade
[2014-11-01 00:41] [PACMAN] upgraded enca (1.15-1 -> 1.16-1)
[2014-11-01 00:41] [PACMAN] upgraded hwids (20140809-1 -> 20141025-1)
[2014-11-01 00:41] [PACMAN] upgraded imagemagick (6.8.9.8-1 -> 6.8.9.9-1)
[2014-11-01 00:41] [PACMAN] upgraded link-grammar (4.8.5-1 -> 5.1.3-1)
[2014-11-01 00:41] [PACMAN] upgraded kdepim-common (4.14.2-1 -> 4.14.2-2)
[2014-11-01 00:41] [PACMAN] upgraded kdepim-akregator (4.14.2-1 -> 4.14.2-2)
[2014-11-01 00:41] [PACMAN] upgraded kdepim-kleopatra (4.14.2-1 -> 4.14.2-2)
[2014-11-01 00:41] [PACMAN] upgraded kdepim-kmail (4.14.2-1 -> 4.14.2-2)
[2014-11-01 00:41] [PACMAN] upgraded libass (0.11.2-1 -> 0.12.0-1)
[2014-11-01 00:41] [PACMAN] upgraded mesa (10.3.1-1 -> 10.3.2-1)
[2014-11-01 00:41] [PACMAN] upgraded libgl (10.3.1-1 -> 10.3.2-1)
[2014-11-01 00:41] [PACMAN] upgraded libpipeline (1.3.1-1 -> 1.4.0-1)
[2014-11-01 00:41] [PACMAN] upgraded libva (1.4.0-1 -> 1.4.1-1)
[2014-11-01 00:41] [PACMAN] upgraded serd (0.18.2-1 -> 0.20.0-1)
[2014-11-01 00:41] [PACMAN] upgraded sord (0.12.0-2 -> 0.12.2-1)
[2014-11-01 00:41] [PACMAN] upgraded sratom (0.4.6-1 -> 0.4.6-2)
[2014-11-01 00:41] [PACMAN] upgraded lilv (0.20.0-1 -> 0.20.0-2)
[2014-11-01 00:41] [PACMAN] upgraded logrotate (3.8.7-2 -> 3.8.8-1)
[2014-11-01 00:41] [PACMAN] upgraded lsof (4.87-2 -> 4.88-1)
[2014-11-01 00:42] [PACMAN] upgraded lyx (2.1.2-2 -> 2.1.2.1-1)
[2014-11-01 00:42] [PACMAN] upgraded neon (0.30.0-2 -> 0.30.1-1)
[2014-11-01 00:42] [PACMAN] upgraded octopi (0.4.83-1 -> 0.4.85-1)
[2014-11-01 00:42] [PACMAN] upgraded opencv (2.4.9-4 -> 2.4.10-1)
[2014-11-01 00:42] [PACMAN] upgraded pinentry (0.8.3-1 -> 0.8.4-1)
[2014-11-01 00:42] [PACMAN] upgraded python2-matplotlib (1.4.0-1 -> 1.4.2-1)
[2014-11-01 00:42] [PACMAN] upgraded unrar (5.1.7-1 -> 5.2.1-1)
[2014-11-01 00:42] [PACMAN] upgraded util-linux (2.25.1-1 -> 2.25.2-1)
[2014-11-01 00:42] [PACMAN] upgraded wget (1.15-1 -> 1.16-1)
[2014-11-04 16:45] [PACMAN] Running 'pacman -Syu'
[2014-11-04 16:45] [PACMAN] synchronizing package lists
[2014-11-04 16:45] [PACMAN] starting full system upgrade
[2014-11-04 16:47] [PACMAN] removed libltdl (2.4.2-15)
[2014-11-04 16:47] [PACMAN] upgraded calligra-3rdparty (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-servicetypes (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-libs (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-braindump (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-data (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-plugins (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-sheets (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-pics (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-words (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-extras (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-filters (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-flow (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-handbook (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-interfaces (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-karbon (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-kexi (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-krita (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-plan (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded calligra-stage (2.8.6-2 -> 2.8.6-3)
[2014-11-04 16:47] [PACMAN] upgraded dhcpcd (6.5.1-1 -> 6.6.0-1)
[2014-11-04 16:47] [PACMAN] upgraded gdb (7.8-1 -> 7.8.1-1)
[2014-11-04 16:47] [PACMAN] upgraded git (2.1.2-1 -> 2.1.3-1)
[2014-11-04 16:47] [PACMAN] upgraded libplist (1.11-1 -> 1.12-1)
[2014-11-04 16:47] [PACMAN] upgraded libusbmuxd (1.0.9-1 -> 1.0.10-1)
[2014-11-04 16:47] [PACMAN] upgraded libimobiledevice (1.1.7-1 -> 1.1.7-2)
[2014-11-04 16:47] [PACMAN] upgraded ifuse (1.1.3-2 -> 1.1.3-3)
[2014-11-04 16:47] [ALPM] warning: directory permissions differ on /tmp/
filesystem: 1777 package: 755
[2014-11-04 16:47] [PACMAN] upgraded libgpod (0.8.3-3 -> 0.8.3-4)
[2014-11-04 16:47] [PACMAN] upgraded libtool (2.4.2-15 -> 2.4.3-1)
[2014-11-04 16:47] [PACMAN] upgraded nss (3.17.1-1 -> 3.17.2-1)
[2014-11-04 16:47] [PACMAN] upgraded openvpn (2.3.4-1 -> 2.3.5-1)
[2014-11-04 16:47] [PACMAN] upgraded qupzilla (1.8.3-1 -> 1.8.4-1)
[2014-11-04 16:47] [PACMAN] upgraded ruby (2.1.3-1 -> 2.1.4-1)
[2014-11-04 16:47] [ALPM-SCRIPTLET] Enabling systemd service
[2014-11-04 16:47] [PACMAN] upgraded upower (0.99.1-2 -> 0.99.1-3)
[2014-11-05 13:19] [PACMAN] Running '/usr/bin/pacman -U /home/felipe/kcp/github/python3-numpy/python3-numpy-1.9.1-1-x86_64.pkg.tar.xz'
[2014-11-05 13:19] [PACMAN] upgraded python3-numpy (1.9.0-1 -> 1.9.1-1)
[2014-11-06 14:57] [PACMAN] Running 'pacman -Syu'
[2014-11-06 14:57] [PACMAN] synchronizing package lists
[2014-11-06 14:57] [PACMAN] starting full system upgrade
[2014-11-06 15:01] [PACMAN] upgraded ffmpeg (2.3.4-1 -> 2.4.3-1)
[2014-11-06 15:01] [PACMAN] upgraded amarok (2.8.0-6 -> 2.8.0-7)
[2014-11-06 15:01] [PACMAN] upgraded chromaprint (1.1-2 -> 1.2-1)
[2014-11-06 15:01] [PACMAN] upgraded efivar (0.13-1 -> 0.15-1)
[2014-11-06 15:01] [PACMAN] upgraded efibootmgr (0.9.0-1 -> 0.11.0-1)
[2014-11-06 15:01] [PACMAN] upgraded gegl (0.2.0-4 -> 0.2.0-5)
[2014-11-06 15:01] [ALPM-SCRIPTLET] To have better integration with KaOS
[2014-11-06 15:01] [ALPM-SCRIPTLET] Select Use GTK+ theme, this will follow your KDE settings
[2014-11-06 15:01] [ALPM-SCRIPTLET] Or download and use the KaOS.crx:
[2014-11-06 15:01] [ALPM-SCRIPTLET] http://sourceforge.net/projects/kaosx/files/sources/chrome-themes/KaOS.crx
[2014-11-06 15:01] [ALPM-SCRIPTLET] This google-chrome theme follows the KaOS color scheme and look
[2014-11-06 15:01] [PACMAN] upgraded google-chrome (40.0.2202.3-1 -> 40.0.2209.0-1)
[2014-11-06 15:01] [PACMAN] upgraded k3b (2.0.2-7 -> 2.0.3-1)
[2014-11-06 15:01] [ALPM] warning: /usr/share/config/kdm/kdmrc installed as /usr/share/config/kdm/kdmrc.pacnew
[2014-11-06 15:01] [PACMAN] upgraded kde-workspace (4.11.13-1 -> 4.11.13-2)
[2014-11-06 15:01] [PACMAN] upgraded kfilemetadata (4.14.2-1 -> 4.14.2-2)
[2014-11-06 15:01] [PACMAN] upgraded konversation (1.5-1 -> 1.5.1-1)
[2014-11-06 15:01] [PACMAN] upgraded libedit (20140620_3.1-1 -> 20141030_3.1-1)
[2014-11-06 15:01] [ALPM-SCRIPTLET] >>> Updating module dependencies. Please wait ...
[2014-11-06 15:01] [ALPM-SCRIPTLET] >>> Generating initial ramdisk, using mkinitcpio. Please wait...
[2014-11-06 15:01] [ALPM-SCRIPTLET] ==> Building image from preset: /etc/mkinitcpio.d/linux.preset: 'default'
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> -k /boot/vmlinuz-linux -c /etc/mkinitcpio.conf -g /boot/initramfs-linux.img
[2014-11-06 15:01] [ALPM-SCRIPTLET] ==> Starting build: 3.16.7-1
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [base]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [udev]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [autodetect]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [modconf]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [block]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [keyboard]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [resume]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [filesystems]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [fsck]
[2014-11-06 15:01] [ALPM-SCRIPTLET] ==> Generating module dependencies
[2014-11-06 15:01] [ALPM-SCRIPTLET] ==> Creating gzip-compressed initcpio image: /boot/initramfs-linux.img
[2014-11-06 15:01] [ALPM-SCRIPTLET] ==> Image generation successful
[2014-11-06 15:01] [ALPM-SCRIPTLET] ==> Building image from preset: /etc/mkinitcpio.d/linux.preset: 'fallback'
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> -k /boot/vmlinuz-linux -c /etc/mkinitcpio.conf -g /boot/initramfs-linux-fallback.img -S autodetect
[2014-11-06 15:01] [ALPM-SCRIPTLET] ==> Starting build: 3.16.7-1
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [base]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [udev]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [modconf]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [block]
[2014-11-06 15:01] [ALPM-SCRIPTLET] ==> WARNING: Possibly missing firmware for module: aic94xx
[2014-11-06 15:01] [ALPM-SCRIPTLET] ==> WARNING: Possibly missing firmware for module: smsmdtv
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [keyboard]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [resume]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [filesystems]
[2014-11-06 15:01] [ALPM-SCRIPTLET] -> Running build hook: [fsck]
[2014-11-06 15:01] [ALPM-SCRIPTLET] ==> Generating module dependencies
[2014-11-06 15:01] [ALPM-SCRIPTLET] ==> Creating gzip-compressed initcpio image: /boot/initramfs-linux-fallback.img
[2014-11-06 15:01] [ALPM-SCRIPTLET] ==> Image generation successful
[2014-11-06 15:01] [PACMAN] upgraded linux (3.15.10-1 -> 3.16.7-1)
[2014-11-06 15:01] [PACMAN] upgraded linux-api-headers (3.15.7-1 -> 3.16.5-1)
[2014-11-06 15:01] [PACMAN] upgraded linux-headers (3.15.10-1 -> 3.16.7-1)
[2014-11-06 15:01] [PACMAN] upgraded mlt (0.9.2-1 -> 0.9.2-2)
[2014-11-06 15:01] [PACMAN] upgraded octopi (0.4.85-1 -> 0.5.0-1)
[2014-11-06 15:01] [PACMAN] upgraded xine-lib (1.2.6-1 -> 1.2.6-2)
[2014-11-06 15:02] [PACMAN] upgraded opencv (2.4.10-1 -> 2.4.10-2)
[2014-11-06 15:02] [PACMAN] upgraded raptor (2.0.14-2 -> 2.0.15-1)
[2014-11-06 15:02] [PACMAN] upgraded sbc (1.2-1 -> 1.3-1)
[2014-11-06 15:02] [PACMAN] upgraded sqlite (3.8.7-1 -> 3.8.7.1-1)
[2014-11-06 15:02] [PACMAN] upgraded strigi (0.7.8-6 -> 0.7.8-7)
[2014-11-06 15:02] [PACMAN] upgraded sudo (1.8.11-1 -> 1.8.11.2-1)
[2014-11-06 15:02] [PACMAN] upgraded system-config-printer (1.5.3-1 -> 1.5.4-1)
[2014-11-06 15:02] [ALPM-SCRIPTLET]
[2014-11-06 15:02] [ALPM-SCRIPTLET] * To enable TOMOYO Linux, append 'security=tomoyo TOMOYO_trigger=/sbin/init' to the kernel
[2014-11-06 15:02] [ALPM-SCRIPTLET] boot options and initialize policy with this command:
[2014-11-06 15:02] [ALPM-SCRIPTLET] /usr/lib/tomoyo/init_policy
[2014-11-06 15:02] [ALPM-SCRIPTLET]
[2014-11-06 15:02] [PACMAN] upgraded tomoyo-tools (2.5.0.20140105-4 -> 2.5.0.20140601-2)
[2014-11-06 15:02] [PACMAN] upgraded transcode (1.1.7-17 -> 1.1.7-18)
[2014-11-06 15:02] [PACMAN] upgraded vlc (2.1.5-1 -> 2.1.80-1)
[2014-11-06 15:02] [PACMAN] upgraded vokoscreen (2.0.0-4 -> 2.1.0-1)
[2014-11-07 11:04] [PACMAN] Running 'pacman -Syu'
[2014-11-07 11:04] [PACMAN] synchronizing package lists
[2014-11-07 11:04] [PACMAN] starting full system upgrade
[2014-11-07 17:27] [PACMAN] Running 'pacman -Syu'
[2014-11-07 17:27] [PACMAN] synchronizing package lists
[2014-11-07 17:27] [PACMAN] starting full system upgrade