FeedDemon stores its data using SQLite, which is regarded as being very reliable even in situations that would cause other programs to corrupt their data (such as a sudden power failure). However, in very rare cases FeedDemon's database may become corrupt.
It should be noted that the most likely cause of corruption is a problem with your hard drive, so it's recommended that you check your hard drive for errors before continuing. If serious errors exist on your hard drive, FeedDemon may not be able to repair the database.
To repair the database, first open FeedDemon's cache folder, which contains your feed data. If you haven't changed the location of the cache folder, you can find it by opening Windows Explorer and typing this into the address bar:
%LOCALAPPDATA%\FeedDemon\v1
Next, download this ZIP file, then extract it (unzip it) into your cache folder. Make sure FeedDemon isn't running, then double-click the file named FDBREPAIR.BAT to start the repair process (which may take a few minutes to complete).
If the repair is successful, the next time you start FeedDemon it will detect that the database has been repaired and double-check it for errors.
Note: A simple precaution against corruption is to make a backup of FeedDemon's cache folder at regular intervals. You can do this by copying the folder in Windows Explorer, or by selecting File > Manage Cache > Backup in FeedDemon.
