I tried adding a new user. At first, everything went ok (2 desktops, taskbar...), but when booting today and entering the new user it had the same problem as the old one (no taskbar, one desktop...).
I will wait a time while saving configurations, mails and data, and then I will reinstall.
Thank you.

If it is an issue as bvbfan posted, can you switch to using one monitor for now? I have been subscribed to these bug reports a while now, expect a fix soon. KaOS will use the needed patch right away when they publish it. Reinstalling is no use, if you are dealing with the above bug.

      demm
      Thank for your help.
      I will wait a fix to the bug. I am managing to work in the current situation.
      In fact, now I'm using both monitors with limitations but I can live with it :-)
      Hope for a quick fix

        Any improvement when running kquitapp5 plasmashell && plasmashell once the system has fully booted up?

        Running "kquitapp5 plasmashell && plasmashell" works perfect.
        It recovers my initial configuration of destop. Minor adjustments are needed (some icons lost).
        Until official fix to bug, this solution works great.
        Thank you very much Demm

        • demm replied to this.

          jotade70 @raul338
          Can both of you test patched qt5-base? Patch used is from this bug report:
          https://bugreports.qt.io/browse/QTBUG-86604

          sudo pacman -U http://kaosx.tk/repo/build/qt5-base-5.15.1-2-x86_64.pkg.tar.zst

          Since the patch is not approved yet, this version won't move from the build repo, until it is tested as fixing the multi screen issue.

              demm
              I have installed. After reboot I reconfigured the monitor layout and wallpapers again. The config was kept after 3 reboots.

              I think this fix is working

                Hello Demm.
                The patch does not work for me. The system behave just like at the beginning.
                I keep using the command you listed-

                One more rebuild for qt5-base is up, this time with the change that started this issue reverted:

                sudo pacman -U http://kaosx.tk/repo/build/qt5-base-5.15.1-3-x86_64.pkg.tar.zst

                  demm
                  Hello Demm.
                  With the last patch I have recovered the original functionality.
                  Everything seems to work OK after 2 reboots.
                  Thank you.

                    demm Today after a reboot, It happened again!

                    The bug report seems to be fixed with a new QT version. I'll have to try with that compiled

                      A patch is now accepted upstream (no longer taken from any bug report), one more rebuild is up, again, please test & report back:

                      sudo pacman -U http://kaosx.tk/repo/build/qt5-base-5.15.1-4-x86_64.pkg.tar.zst

                        demm
                        No problems with that last patch. Everything works as usual.
                        Regards