Quoting Bjarne Thomsen <bjarne.thomsen@(protected)>:

>>  Does this happen if you specify
>>
>> Section "Extensions"
>>   Option "Composite" "Disable"
>> EndSection
>>
>> in xorg.conf?
>>
>>  If yes, then it probably is correctable in the python code
>> itself, or should work correctly if you also use

> Indeed, it works when I insert
> Section "Extensions"
>   Option "Composite" "Disable"
> EndSection

> I notice that XFdrake removes "Disable"
> when I enable 3D effecte.

XFdrake does the wrong logic. Composite was changed, by upstream,
from default off to default on. There is a bug report at
https://qa.mandriva.com/show_bug.cgi?id=38841
but it doesn't clearly describe that XFdrake should also switch
it's logic.

> So it looks as if have to choose between
> having 3D effects and being able to run the
> python scripts. Is that correct?

If you can't live without compiz or kde 4's new kwin effects,
then you are in trouble :-) Is this script packaged by mandriva?
Otherwise I suggest reporting upstream/the script author. If
you can post it, or a link to it, I can also try to make a patch.

> -- Bjarne

Paulo