Edited to clarify:
When I changed my WordPress theme to TwentyTen, my RSS feed stopped working. I had it set up to feed new blog posts (my WP site) to my primary website.
I tried doing a number of things, but I can't remember what I did. However, at one point, the feed started working (but that may have been with another theme).
At this point, I'm not even sure if TwentyTen supports RSS feeds. Does anyone know? Does anyone have any ideas how to solve this issue? Although at this point I'd rather not change themes yet again, is there a (free) theme that will handle feeds without much hassle?