I would let it sit for about 5-7 minutes, but I think I found the problem. There was a bum particle file that I hadn't intended on leaving in, and that was what would freeze it. I just tried exporting it now, and it worked like a charm.
Now that I got Pinkie's Maze to work, I, for some reason, can't get into Pinkie's Playhouse. There's a portal between the two, but every time I go to the portal in Pinkie's Maze, it just says "Cannot find map file."