Well I just got the stuck-on-the-lot bug. My Uni Sim has a gym and uses the pay poll thing. He dose not own a car. He took the taxi. I played for a few days on the business lot. I had him call a taxi then closed the business. He started blowing his whistle and yelling. He never stopped! Even when there was no one else on the lot. Or when the taxi showed up to take him home. I tried to exit out and told him to get in the taxi, but he was stuck in a loop. I deleted him, thinking I could just reload the lot. Well he was just standing there but the live mode is missing. It is just build/buy mode now. The lot shows him as being at his business, so now I can't play the dorm he came from. I will try the lot debugger hack and see if I can get everything working again.
Oh and I never saved the lot till after I deleted him. I don't normally save a business lot since it dose it when you leave.