Well in that case for anyone in the same situation, if you have any movie with the studio logo not displayed, a quick edit to the nfo will fix it. Just open the nfo, check studio, if there is more than one delete all but one of them, refresh the movie. If there isn't a studio, reference IMDB, add the studio and refresh the movie. Problem solved.
One of the advantages of doing it this way is that now that my setup is truly unique, some of those movie taglines didn't exist so I had to make my own. Can be quite a challenge until you get the hang of it. I wanted to add some of my custom taglines to TMDb, but I don't think it's possible to add them to existing movies for some reason. Odd.
Maybe I should start a thread exclusively for the best movie taglines....although judging by the amount of time I already spend on the forums and XBMC, maybe not