Hi.
I was downloading few files from letitbit. In the middle of the process I've got a link down. So current download was crashed & restarted as only my link got up. But temp download file from previous attempt named "bla-bla-bla.7207651447829982420.part" was still stored on my disk & I could not delete it manually until FreeRapid shutdown. (It was not temp file of restarted download, but from the crashed one).
Freerapid version - 0.81
Letitbit plugin version - 1.0.0
Good luck.