Jeez, when it rains, it, uh, rains slightly harder.

Okay, so in my custom neighborhood I've got alien twins and I sent them to college. One of the girls' grade meters is stuck on the lowest level despite her having all the necessary skill points. Her sister's grade meter is normal. I've tried having her change her major and change it back, I tried using the college adjuster to add a point to each of the required skills (thinking maybe the game wasn't recognizing that she had the points or something), and she's been to class and back. What gives?

Screenshot

Try deleting her with "move_objects on", that should fix her.

Deleting with moveobjects on won't delete your sim forever - you do have to save and exit to the neighborhood for it to work, but when you come back they will be standing by the mailbox with motives full. It can fix a number of problems.  However, since moving back in to the old house didn't work but moving to a brand new one did, I would suspect that it was the house that was the problem. Was it, by any chance, one that came with the University?

My problem was also with a Maxis-made house, although mine was with one of the wee two-story ones in La Fiesta Tech. I think the premade houses oftne have problems, although I have no idea why that would be so.