I just spent the whole afternoon dealing with a major problem on my end with the University world.
Apparently, traveling there for a second term makes the world unstable as hell!
I encountered EVERYTHING!!
First, I had a hard crash to the desktop. No warning, no "Something went wrong" prompt. The game just stopped and quit on its own as my Sim was entering the lot where the Graduation Ceremony was to be held.
Now, foolish me didn't realize I never once saved during this session, so while I was trying to repeat the big events that happened during that play time (namely Graduating with a perfect A), I encountered several other things that were not reported as of yet.
I had my Sim join the Frat House every time he moved there, but upon saving shortly after moving in and chatting with a few of the NPCs (AKA the non-travel phase), pretty much all my attempts to save were hit with Error 12s. Keep in mind that there is NOTHING NPCs can do in this world that would generate items in their personal inventory or in the world short of Winter coming along and all of them building snowmen and igloos. I have no idea what caused the famous Error 12 to pop up so early into my second visit to the University world.
Attempting to save using different methods eventually got past the error, but it would keep popping up every so often. Again, to the best of my knowledge, nothing was added to any of the NPC Sims inventories or any other storage/inventory in that world to warrant this. My own Sims inventory has been kept to a minimum of personal items, namely his WA camera (for testing purposes), MP3 player, DJ Booth, 5 Potent Invigoration Elixirs, Art Bag, Sketchbook, Megaphone, and Textbook. Nothing more, nothing less.
I also noticed that after one of my successful saves, my "family" portrait in the main menu showed that half of the NPCs were corrupted Sims, complete with disjointed limbs and missing texture renders. This image stayed constant in the loading screen and when I took a peek in Edit Town with that same game. The Sims themselves in the world did not exhibit any of these aesthetic deformities, but they didn't behave properly either, often disappearing in the middle of an autonomous social action to reappear on the other side of the lot. The most extreme was one NPC disappearing from the basement of the house only to reappear next to a bed where he disappeared again and reappeared with his Sleepwear outfit next to yet another bed on the ground floor.
Eventually, the corrupted portrait was fixed after several attempts at saving and by-passing yet another series of Error 12s.
Then I noticed moodlets freezing. By this, I mean that the moodlets that have countdown timers were not counting down. This started after I had my Sim drink a Potent Invigoration Elixir I had him bring for this session. He gained the appropriate moodlet, but it failed to count down from 24h. As of my last successful save (again, kept hitting Error 12), the moodlet still reads 24h on the countdown despite it being 5 hours since he gained it.
When the above happened, I also noticed his needs and Academic bars stopped moving. The arrows indicating a loss or gain were appearing, but the bar itself was not moving for any of the needs or for the Academic Performance of the term. This caused my Sim to constantly be stressed out (coupled with the frozen moodlet timer) with painting not helping him relax or gain progress in his Academic Performance.
Scattered between these bugs were several hanging events that would happen during my attempts to save. The HDD would should activity in the usual rhythm to indicate it was saving, but the game wouldn't return to a playable state. I ended up having to do several Force Quits, resulting in the loss of data back until the last successful attempt to save the game.
The past 45 minutes before I started typing this have all be Error 12 due to the addition of a painting that my Sim made that I actually want to keep. I ended up calling it quits after that, yet I'm still puzzled as to why this Error keeps popping up since the painting was the only new item I was going to add to my Sim's personal inventory.
FINALLY, upon exiting those attempts to save, everything on the main menu was black EXCEPT for the buttons that you press to select options from. There was no background, no blue box, no text explaining which saved game I selected or what each of the buttons were labeled as. Just blackness and the buttons. I'm lucky that I knew what each button does and where each option was in the sub-menus.
Bottom line: I don't think the University world is very stable if you go back for a second visit/term. At least for me it wasn't. I never once had any of these problems when I was there for the first time, so I don't know what's going on now that's so different other than the fact that this is my second time going to the University.