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I took a look at the database, and the timestamp in the pp_cache table changes to another non-zero value immediately after I move a picture. No thumbnails, though. If I manually reset the timestamp to 0, the thumbnails become visible.
Does this give you any clues?
Where does that source code come from, BTW? I tried to grep for it and found occurences of "move_image_cat" in 4 files, but none of them had the code in your quote.
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