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So I just login today having 400 maps in the "unknown" status and with the wrong background preview (from another map). It's confusing as hell as I was using this to find the maps I liked. Any idea how to fix it without having to redownload them? -.-"
Close osu!, navigate to your installation folder and move the file "osu!.db" outside of the folder. Restart osu! and the database will be recreated and your maps should start reprocessing.

This has the side effect of marking all of your maps as unplayed, however it is currently the only known solution.
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