I don't think you will see this problem with Themes turned off.

>I'm sure I'm not the only one to have noticed this, but there is some really ugly bleeding of text when ClearType is enabled. That is, the text appears much fatter than it should be. In some cases the text starts out looking OK, and as you refresh the form it suddenly gets blobby looking.
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>I grabbed a snapshot of some text when it looked OK and when it looked weird and it appears that the anti-aliasing that is normally added is more pronounced on the bad-looking text. Specifically, the colors used in the aliasing effect are much darked than they should be (instead of a light blue, it's a dark blue, instead of a light yellow it's a dark yellow, etc.)