just built an svn version
when moving mouse over some UI elements some garbage appears - here is the screenshot - you can see it in the right top corner.
is this blender problem or just my local - drivers maybe?
also i cannot read most of tooltips because they are written with some hardly readable font where glyphs are missing half of pixels. i didn't manage to screenshot it but this problem is also present on the screenshot - look at "User Persp" and "(2) Cube". i think these problems are connected.
Looks like yet another case of video card & driver not doing OpenGL very well.