>It looks like the font for the message area has recently changed. I find it a little harder to read, it seems a little smaller and isn't always rendering as cleanly (in FireFox, anyways). It's hard to find an example, the closest I could find is the second "t" in "Chatter" near the top of the attached image.
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>Alignment of some elements is off as well. When reading a message, all of the header captions except Forum and Category are vertically misaligned with respect to the field contents (as shown in the image). Maybe this is a side effect of the font change (?)

Simply click on Options and put Arial in the "Message and treeview font", if you want to have the same old font back.

Then, you may adjust the "Message and treeview font size" accordingly.