In IRC some could reproduce and I got much needed feedback. Seems this is an upstream issue. Went back to the last known good commit, September 23 2016 and build with that, should be fixed, please test too:
sudo pacman -U http://kaosx.tk/repo/build/k3b-1%3A2.9.96-1-x86_64.pkg.tar.xz
if good, then it will move asap to all users