>>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 (?)
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>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.

I just noticed another issue. When logging in for the first time today, just now, the Treeview font is still Calibri 14 even though I specified Arial 13.

When I was testing last night I was clicking on Time Warp...2 hours to refresh the Treeview. I suspect it will do that again, but on initial entry I'm getting Calibri.

UPDATE: confirmed, anything that updates the TreeView pane updates the font to whatever the user specified.