Yup, case insensitive, but, I did find the problem. It was complete silliness on my part. I was already pulling ThemeName to stick in the title bar, so I figured I'll just recycle that. I was checking the file path's name to see if it contained the ThemeName - if it did, it went to the Theme Files menu. BUT, since ThemeName can be something totally different than the theme's actual directory - well, you get the idea. When parsing the info, if ThemeName didn't show up in the file's path, it would just dump everything in to the personal menu.

Anyway, it's all fixed for the next update. I now check for actual directory names, like I should have been in the first place. ><