I've done a lot of searching, and I haven't managed to come up with any solutions or even a similar description of my issue just yet.
When I go into the theme editor (or, as it turns out, the widget editor has this same issue) whenever I click on one of the files in the list to the left, it acts like it's reloading to load that file in the editor-- and then it shows me the first file again. It's permanantly stuck on "style.css". My permissions are all set correctly, I promise. I've also emptied my cashe, and rebooted my computer. In addition, I don't have Theme switcher or any other theme plugins installed, and I haven't had them installed at all on this current installation/database.
I can obviously edit the files manually, and forgo the theme editor, but I've been having a lot of issues with WordPress installations (thus the downgrade back to 2.1 from 2.3 for a completely seperate issue.)
I love WordPress as a designer, and I actually understand theming and how it's all supposed to work. I'd love to use it, but I'll admit the slew of technical issues is a bit daunting....
Thanks in advance for any thoughts~
EDIT: In addition, I've tried three different browsers, to make sure it wasn't some kind of browser issue (I generally use Safari on OSX).