RH8 Missing styles in drop-down

I installed RH8 about 3 weeks ago and my styles were working fine. Now when I'm in a project and I click the drop-down box to change styles, the styles box is empty. I've opened up 3 other projects and getting the same result. (see attached screen shot). I had a co-worker open one of my projects and he sees the styles fine so it isn't a problem with the project.

When I click anywhere in a topic page, the correct style shows in the style box, but if I try to change it by clicking the styles box, the box is empty.??????

I then uninstalled and reinstalled RH8 and am still getting the same problem.

Anyone have any ideas? I've run out of ideas to try to fix this.