You need to specify what/how you ripped the disk.
But if you ripped to ISO you would be copying the entire contents of the disk with the menu. But MC doesn't work with BD menus, so that might be your problem.
The easiest way to rip multiple episode BD disks, IMO, is to use makeMKV.
http://www.makemkv.com/You would select the episodes you want (skip the extras, etc.) and end up with a single file for each episode. Makemkv rips to a file format like "title00.mkv, title01.mkv, etc. (although there is customization you do to improve file naming).
Then you have to rename the files to whatever they should be called (like "SeriesName.SxxEyy.mkv where the "S" is for Season, "xx" is season number, the "E" is for episode, and the "yy" is the episode number). MC will then automatically download the cover art and episode information). The hardest part is figuring out which file is what episode (usually you have to watch some of it to know).