I've been working on modifying the fixer theme to meet my needs. After a week of feeling dumb because I couldn't figure this out I started making good progress. Last night, when I made a bunch of changes, I clicked the "Save" button in the Upfront editor. I got a error saving changes message, and then the browser tab hung. Just now, I was going to update the page to set a repeating background, and got the same error, but at least this time the browser didn't hang.
If I were a betting man, I'd be betting on me doing something silly. Thanks in advance for your help.
PS: My broswer is firefox.