I use Omea Reader for reading my blog and newsgroup lists. It's free, it's handy, it's powerful, it's offline so I can read my blogroll while I'm driving back and forth to Columbus for work. Just kidding, folks. Really.
A couple weeks ago all the lists in Omea's views and feeds lists showed up as duplicates. Ugh. Furthermore, the "Unread" view flat out wasn't working, meaning I needed to troll through a whole lot of junk when I just wanted to see new posts. Ugh.
Easy fix: run "dbrepair.exe" from Omea's folder under Program Files. First back up your Omea files (local data folder in your user folder), then run "dbrepair.exe /fix" to repair any busted links, clean up the indices, and do a lot of other general repair.
Poof! Everything's back nice and shiny.