I recently posted on the bug reports for kwin4 crashing but the offending patch still hasn't been removed, could it be done soon - it would clear off 3 bugs ;)
Main bug::
http://qa.mandrakesoft.com/show_bug.cgi?id=741
2 dups:
http://qa.mandrakesoft.com/show_bug.cgi?id=4574
http://qa.mandrakesoft.com/show_bug.cgi?id=2069
Cheers cris.
