Ajax Masthead Link formatting

I realize I can change the looks of the Ajax Masthead links with the theme. However, recently I was working on creating a couple URL Aliases, and all of a sudden the formatting on the links in the Masthead were messed up. The links I am talking about are the ones that say: "Back", "Forward", "History", "Favorites", etc.

Instead of nice buttons, they are now large black letters, and if you click on them the drop down menu is only text, no formatting.

Any idea what I did to mess this up, and how I can fix it? I didn't make any changes to the Ajax masthead's code at all. I have already restarted the portal server, but that didn't help.

Thanks,

Owen