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This is an update regarding the new RSS by Release that went up yesterday evening. See this post for more context:
Yeah, it seems that some readers aren’t wanting to eat the new RSS. It’s a bit of a hack of the RSS spec, as it lists things out of chronological order. So if your reader is looking to sync up on a schedule, it might be freaked out by seeing entries dated 2005 before entries dated 2008. From what I’ve gathered so far, Firefox is seeing it, as is Thunderbird, as is the IE reader. Some aggregators are able to read it, Yahoo, the like — others aren’t. I unfortunately have no solution right now except hope for the best. I’ll try to do some research on how to better and more reliably hack this and I have some ideas to try. But I’m sure you’d all rather have me working on Myst-related stuff than hacking WordPress further. 
I’m implementing some changes tonight. Please keep me posted as to the efficacy. Especially those of you who had a problem with the previous version.
Update:
RSS by Release Updated: it is now disclosing the date published as the most recent modified date, instead of the chronological date. This should allow readers to see the feed as being in order. The trade off is that you will not be able to see the chronological date of post without clicking into the site.
10:27 pm
Mar 01 2008
Still busted for me. What’s interesting is that it sometimes loads in Firefox as a valid feed, but other times it just shows up as plain XML with the message “This XML file does not appear to have any style information associated with it. The document tree is shown below.”