some desktop effects stopped working after update to kde 4.7

I have seen already this thread about a similar problem, but it didn’t resolve mine.
When I try to change some settings on desktop effects, I always get a message of this kind:
Kwin Window Manager
The following desktop effects could not be activated:

  • Blur
  • Cover switch
  • Desktop Cube
wrbbt:~ # uname -r
wrbbt:~ # cat /etc/SuSE-release 
openSUSE 11.3 (i586)
VERSION = 11.3
wrbbt:~ # lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 0c)

Any ideas? I more info is needed, please, ask.
Thanks in advance.