I did a forum search on the topic and found a zillion similar threads and dutifully read the most recent, with no joy so far. The salient points are:
-My RSS feed works fine in some readers, not others
-Per Bloglines, sweasel.com/feed and sweasel.com/atom haven't updated since May 16 and sweasel.com/rss hasn't updated since March 7
-I'm not getting an error message
-It appears valid: http://validator.w3.org/check?uri=http://sweasel.com/feed
-I have upgraded to the latest version of WP twice since I discovered the problem, didn't help
-The keeper of fix-rss-feed-error-wordpress-plugins.htm let the domain (http://www.flyaga.info) lapse earlier this month, so I can't get the plug-in to strip blank lines automatically
So far, I've found a number of .php files with blank lines at the end, which I gather can be at fault. Do I have to check every .php file in the whole install, or only certain directories? Are commented lines or blanks in other places a problem? Since I'm not getting an error message, is the blank line issue likely to be the deal here? You can imagine how eager I am to do this job by hand.
Any insight anyone has would be much appreciated. I don't use a feed reader and I have a very weak understanding of how feeds work.