In the last 2-3 months, my Linux installation suffered some problem:
-KDE desktop effects not working (I miss my wobbly windows)
-Occasional KDE Plasma crash (Usually happen when click so fast in Taskbar thumbnail)
It started after upgrading to KDE 4.9 (Now I use KDE 4.10.1 and the problem remains). During search in PCLinuxOS forum it turns out that these are not uncommon problem.
-Main culprit for desktop effect not working:packages Intel/Mesa/X.org need to be updated
-Main culprit for occasional desktop lockout and Plasma crash: package KDE widget smooth task fork need to be patched.
And as expected updates cures these things. Intel/Mesa/X.org updates brings back the desktop effects. Reinstall smooth task package from repo fixes the KDE crash. Happy ending! Now please excuse me, I need to go back to work.