Problems with 1.5 (1/25 nightly) and rss

I upgraded to 1.5 last night to fix some awful login/logout problems I was having with 1.2, and that worked, but now my rss feeds are broken.

Well, sort of.

In Thunderbird I can access the rss feeds just fine, but in RSS Bandit and Sage the feed fails, giving me an “invalid character at line XX” error. I really can’t see anything that looks error-y in any of the latest posts, and setting them as drafts (unpublishing them) doesn’t seem to help.

All recent posts have html in them, but nothing exotic–just some li’s, em’s, and some links. But could html be my problem anyway? Any ideas?

Thanks in advance,
Jessica