As an attempt to remedy the problem I installed and enabled the restricted ATI driver "xorg-driver-fgrlx" and corresponding "xserver-xgl" via synaptic. After reboot I did not experience any freezes, but saw that rotating the cube suddenly consumed more processing time than before (I guess it must use sw rather than hw to render). So I decided to revert back to the open-source driver (uninstalling both packages) and I have not seen any freezes yet. I have slowly enabled various plugins (not the animations yet though) and are still not experiencing freezes.
I'll keep testing and trying different configurations and return with more info :-)
As an attempt to remedy the problem I installed and enabled the restricted ATI driver "xorg-driver-fgrlx" and corresponding "xserver-xgl" via synaptic. After reboot I did not experience any freezes, but saw that rotating the cube suddenly consumed more processing time than before (I guess it must use sw rather than hw to render). So I decided to revert back to the open-source driver (uninstalling both packages) and I have not seen any freezes yet. I have slowly enabled various plugins (not the animations yet though) and are still not experiencing freezes.
I'll keep testing and trying different configurations and return with more info :-)