I have 11.4 with kde 4.6, all up to date via YAST.
Radeon driver, legacy ATI display hardware.
LibreOffice is latest from the Stable:11.4 repo.

When I open LO, it causes the desktop to break up - diagonal stripes of blocks, and garbage (offset blocks) form all mouse movements from there until kdm restarted.

I restart by switching to F1 console, init 3, the init 5 as root.
I can't seem to find any useful messages or logs.