Right after running clean up I found a couple of new feeds I wanted to add. One gave me no problem, but the other somehow simply replaced an existing feed without changing the feed name - just the content. It took several tries of deleting feeds and re-adding but I finally got it straightened out and have all three properly settled,but how would this happen, and more to the point how do I keep it from happening again? If it is any help the feed that overlaid the content (but not the name) of the existing feed was a Feedburner site - and I know RSSOwl and Feedburner do not get along too well, but this is a new one to me!
Maybe you were subscribed to this feed in the past before running clean up?