If you're getting kicked back to your dorm room every time you try to load one of your custom rooms, you can try restoring the room to a previous save. You can do this on rec.net by clicking on your profile in the top right, selecting "Rooms," and picking the room you're having trouble with. Open the room settings by clicking the gear, and then select "Version." You can then select a previous save to restore to.
If your room is still experiencing problems, submit a support ticket and we'll take a look.