My XBox 360 Skyrim Buggy Places, so far-
I keep finding these nasty things in the game, little by little as I progress...
The latest is Understone Keep. These are the all out evil, game wrecking, bugged to partly-bugged that make you nervous, weirding out locations on my Skyrim game - so far - as there might be more to come up.
These first three bugged places tick me off the most: Understone Keep, Jorrvaskr, and Blackreach. These ones I hate because they ruined two guild lines for me, and put a stop to any unfinished quests I had yet to do.
Understone Keep - I hadn't had problems with this place until the quest Hard Answers, a mission for the Thieves Guild, and now the game crashes on entry (black screen with level meter) every time I try to go in there. Have not found a fix for it, so the Thieves Guild storyline is suspended, and a lot of Markarth stuff is now inaccessible, like Moth gro Bagol, a blacksmith I visit regularly. Luckily I already finished all the Thane of the Reach stuff for that region, but I never did any of the Dwemer ruins quests for Calcemo. I hope I can find a work-around against this evil bug so I can finish those quests and see some Markarth friends once again.
Jorrvaskr - Building exit crash, THIS SUCKS!! (gray screen) - I can go into this place just fine, but getting out is the hard part. It goes to a gray screen when I try to leave, and often crashes after this. If I am lucky and it only partially crashes, I can then listen to the map cursor noise and hit fast travel, it sometimes is an escape. It seems to work more often if I try to leave while in sneak mode. Now with this bug, I can't use Jorrvaskr as a headquarters anymore.
Blackreach - Game lags and freezes up, badly. It just freezes during play. - Here, I have to use sneak mode and avoid enemies and save very very often. Running, and fighting enemies in Blackreach crashes the game. It took me a bunch of save-and-restarts to finally finish the elder scroll mission in Blackreach. I am afraid to try any more quests that need me to go to Blackreach for any reason.
Helgen Keep - Freezes the game on attempting to enter - It doesn't really matter a lot for me that this place crashes since I don't really need to revisit this place.
Treva's Watch - Game crashes upon approach to the fort or the campfire.
Then there are these, who were a pain, but manageable:
Pinewatch - Often freezes when using the main the doorway of the cabin.
Dreagonsreach Jarl's room - People become invisible sometimes, including the Jarl.
Labyrinthian - This place has a few graphical errors, but I haven't approached them to see if they are holes or not.
Darkwater Pass - This place has some graphic errors, these errors have fall-through holes that drop can you somewhere lower down, and the game sometimes crashes in this dungeon. I rescued Derkeethus, but now I avoid this place because I don't trust it.
Dark Brotherhood Sanctuary Falkreath - Graphic errors, fall-through holes. I don't go to this place unless I really need to.
Broken Oar Grotto - A dead thrall no-go place, don't take dead thralls here, or you'll lose them.
Yngol Barrow - A no-follower place, and this place tends to freeze up.
I keep finding these bugged places as my game progresses and gets more corrupted. Skyrim is a really neat game, but the bugs and glitches can get extremely annoying. After Jorrvaskr became bugged, I didn't play Skyrim for 2 weeks. That almost made me quit Skyrim. Understone Keep pissed me off a lot too, ruining my Thieves Guild questline and making Moth gro Bagol and Calcemo inaccessible for business. I am still simmering mad from that.