I had a similar looking issue yesterday and it turned out that I was missing the theme referenced in the user preferences. I edited the user preferences by hand and restarted Sublime and everything returned to normal...
allanbranch wrote:You are a beautiful person, this worked. Thank you so much.
Sublime needs better error handling.
Hehe...glad I could help. I guess it would be difficult for Sublime to know when a theme is corrupt... But it might be nice to be able to start Sublime up in some kind of "safe" mode where the user plugins and settings are all disabled.