After finishing the Calvicus Vile quest (at least, that was the last one I did in the area) I can't get almost anywhere in the Southwest corner of Skyrim. Game closes whenever pass Cracked Tusk Keep to Shriekwind (I can go into Skriekwind but not the Overlook. I can make it to Angi's cabin if I stay on the very edge of the map, but that's about it.
I haven't really done anything in Falkreath yet, but I do have the Dragonborn expansion, if that helps. I'm not using my own account to post this, so if I don't reply or reply on a different account, that's why.