Version:            (using Devel)
OS:                Linux
Installed from:    Compiled sources

I enabled showing window geometry to test my new site on lower resolutions by resizing the firefox window. As I was resizing I held it down to a lower resolution and adjusted to be exactly 800 or 640 which is why I held it longer than people usually resize.

As I did that suddenly everything jumbled, black appeared then half a window, everything completely jumbled up as if something just broke somewhere that instant. It was operating quite smoothly and without artifacts until that moment.

Here is the screenshot: http://memenode.com/misc/reports/jumble.png

I had xrender enabled instead of opengl because that made resizing windows faster, but after this incident I had to switch to opengl again and even then there are some artifacts remaining, like in the panel. Here is the shot of that: http://memenode.com/misc/reports/panel_jumble.png

This is a KDE svn from the kde-nightly package of the "Neon Project (KDE)" (at launchpad ppa). Exact version is: Version 4.2.93 (KDE 4.2.93 (KDE 4.3 >= 20090623))