Ah, that would explain it- sorry!
Now I have a problem, though. I have ~650 movies. I got all the info for them during build 73, but of course no cover art was downloaded. Then I saw the mess that the [genre] tag was filled with (you've probably read me lamenting about this elsewhere), so I manually went through and fixed as many as possible. Now they're lacking cover art, and I was hoping to get just these, without rerunning the 'get info' for multiple files, because that doesn't give the option of getting art only. I guess I'll use my new work around of copying [name] and [genre] to a new field, getting info again, and then moving my custom name and genre entries back to [name] and [genre].
Or can you suggest another way?
Do you think extending get cover art (only) to movies would be useful to others too, who don't want to mess with their existing data?