KDE crash when effects & OpenGL enabled

["Manolete, ese artista..." <variosinftk@gmail.com>]

I have updated several packages from unstable this afternoon (I suspect of some libqt* packages, maybe libqt4-opengl?) two machines, one with ATI open driver and the other with Nvidia private driver, both systems with Xorg 7.4, and both machines crash when any effect is displayed (present windows, a simple dialog and shadow drawing, etc) unless I select Xrender, or I disble all the effects.
I have tried a new user and it happens the same. If I tried to downgrade those libqt* stuff to the version in Squeeze I'd have to downgrade KDE to 4.3.1 for not breaking dependencies, so by now I'm working without desktop effects.

Has anyone experienced the same, or know if this is an upstream bug or a Debian one? Google isn't too informative about this.


Regards