I'm bookmarked straight to my user cp page, which contains only the forum subset I'm interested in.
I think I figured out what changed. The 'small' banner and the navigation links used to be in a row (<tr>) of their own, but now have been placed in the last cell (<td>) of the previous row. I think this is just finger trouble, since there's nothing else in that cell anywhere on the page, but it does cause the page to run off the right side of my 800px screen.
Not a big deal, but maybe a mod will see this and put it back