Using the newest version of Ubuntu, freshly installed. NVIDIA GeForce GTX 560 Ti. It's mostly the font that doesn't render well, I think. Small logos do it too, sometimes.

Screenshot to clarify (see bookmarks, search bar, etc.).

EDIT: Another screenshot.

And, sometimes when I start up, I get only a black screen saying [OK]. I can move my mouse around, but nothing helps, except for restarting.

Also, my desktop picture doesn't stay the same. Every time I start up Ubuntu it goes back to the standard purple background.

They're not very serious problems, but it's all a little annoying. Thanks in advance for your help.