I use Ubuntu 11.10 with gnome 3 and Unity. In either case, I use two KDE apps a lot - kile and kate. Since the latest upgrade, I have observed two problems:
a] I can never use Alt+F to select the file menu (works with other apps), yet when I press Alt, kile's menu comes up in the status bar.
b] A few times every day, while using kile (haven't used kate as much recently), the keyboard stops responding (just in the 'editor' portion, rather than in structure-tree navigation). I cannot enter any text, but mouse works fine. I usually restart kile to continue working.
One inconsistent way to reproduce it (multiple times today):
I cut text from one open document using Ctrl-X
switched to another document in the same kile window using Ctrl-Tab, then this happened.