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Hello! The absence of objects in Tiles and Objects is related to the appearance of a one-kilobyte index.bin; but if the categories themselves have also disappeared, I can share my XML files with you this evening (although they may also contain plugins for Maya).
UPD: I've already solved the problem. A simple reinstallation helped. It's a good thing I managed to copy my work on the videos beforehand. Otherwise, they would have been lost along with the data folder.