After upgrading to 3.05, experienced serious issues with Fedora KDE. I tried reinstalling and also tried installing OpenSUSE. Both experienced the same problems. Periodically all apps would force close and the whole Plasma shell would crash - the screen would be completely black except for my cursor. Only option would be a hard reset.
After downgrading back to 3.03, I haven’t experienced the problem. Just wanted to warn others, maybe it only affects KDE.