Comment 19 for bug 446578

marcinq, in the upstream bug report there is a specific change flagged when the crash first appeared. To better understand the cause of this crash it would be worthwhile to test if dropping that change makes the crash go away.

For your convenience in testing this I've created a ubuntu package with this patch reverted. Could you please install from this ppa and restart X, and see if you are able to start without kwin crashing. This will give some good insight into how we can avoid this problem for kubuntu users.

https://edge.launchpad.net/~bryceharrington/+archive/beige