Something about the thread "Weather snippet" is causing the RSS feed to be invalid. Here's what my feed reader has to say about it:
XML Parser: Could not parse document:
Entity: line 118:
Input is not proper UTF-8, indicate encoding !
Bytes: 0xC3 0x3C 0x2F 0x64
h/weather.h:67: error: variably modified </description>
XML error while reading feed! Feed "http://www.smaugmuds.org/index.php?a=rssfeed" could not be loaded!
(I hope that maintained format...)
I think it might have to do with Unicode characters pasted into the post, but the RSS feed probably doesn't advertise that in the character encoding. Just a guess, though...