Well, I spoke too soon. It shows up and takes forever to go through the 1100 movies, then I check 1 or 2 or 5 to get subs for, and it either comes back with "An error has occurred. Please restart Media Center before proceeding" (in which case when it restarts, no movies are listed, so have to re-start the whole process). Sometimes, it just says something like "0 subtitles downloaded. 0 errors." I uninstalled it, reinstalled it. I let it index the movies and then re-started MC, which did result in it saving the movie list, but still get the same errors. I get the same errors when I try to dl subs for a number of different movies, trying one at a time, so it isn't just on one or two particular titles.
And I still think that one should be able to right click on a movie and select "get subs" rather than having to wait 15 minutes for it to go through every video.