Oddities in Berlin 2.0

Hi.

I've just upgraded to Omeka 2.1.2, and Berlin has gone wonky on me. In particular, the navigation tab images are not showing up, as in under Browse:

http://www.nineteenthcenturydisability.org/items/browse

I also find that the site is not nicely centered as it was in 1.5.3. I'm not sure how many columns are in this layout, but it seems far more spread out than it should be.

Any guidance in whether I've installed everything correctly, and what I can do to fix this would be much appreciated!
Karen

Update: I refreshed my browser a couple of times and now the theme does seem to be nicely centered, but the navigation links still aren't styled.

Sounds like it could be cache issues. I'd try clearing out the cached files for the site