I use Blender 2.34 on a Debian unstable box with KDE 3.3 and apt-get update nightly.
Blender recently began display strange, “blocky” behavior. The cursor in Blender would not smoothly transition as I moved the mouse. Inverted blocks of color would follow the cursor on the screen and when clicking through menus.
The program is useless in this mode.
I never had problems previously, however I recently updated KDE from 2.3.2 to 3.3 and believe the cause to be a problem in the underlying libraries. Perhaps a different window manager will solve my problem. I am cross-posting this to debian-kde and Elysiun.