Two days ago I found out that iTunes interface become buggy. Here are some screenshots:
UI bugs in listview headers:

iTunes doesn't download app icons in App Store:

CoverFlow doesn't show album arts:

Finder and other apps are working well, without any artifacts. Macbook 062 (Intel C2D 2.13, GMA950), Mac OS X 10.6.2, iTunes 9.0.2.
I have reinstalled iTunes via Apple's site - nothing.
What do you advice to do?