[pigeldi]

Thanks for the explanation, indeed the first command shows a lot of hits, which should explain why those movies are still there. I was not aware of this behaviour for library cleaning.
I think I could also get rid of those by finding out their IDs, searching for "C:\xbmc".
These are leftovers after exporting the library, changing the path and importing it again. So the movies are there, just besides the correct thumbs they also have those outdated ones.

But this does not explain why it also deleted the correct entries. The movie Avatar is in the library, and when I look at the info screen, it also shows the path smb://syno/filme/Avatar (2009). I can actually also play it from there. But somehow the vclean and P deleted those entries, so the movie is still in the library, but its pictures got deleted.

P.S. The remove command is also not in the wiki, I guess it is not updated on the latest version?