I seem to have problem with seeing even default Blizzard UI. No borders for buttons are showing up, the world map is all glitchy, etc. I have tried reloading UI several times, with and without addons, but to no result.

If it helps, the same thing happened at the release of 3.2 on live, but a quick UI reload fixed it.

Do you have an Intel GMA 965? If so, you'll want to check _____Known Technical Issues (Update 10/20/10)