Tried to add a new sub-folder for "Other OCs" but I can't. (Tried adding a folder in a different group too, in case the "sort by character" group just had too many subfolders. No dice.)

Did I max out the number of folders? Does anyone else have this problem?

[ETA: Yep, I had maxed out the number of folders. I removed some that didn't seem so useful. Thanks everyone for your input :3 ]