I was having this problem shortly after I installed Dawnguard. At the time, I had a long list of mods loaded. I gave up for a while out of frustration, later cleaned out my skyrim folders, uninstalled and redownloaded. I have a small number of 'essential' mods and a minimal frivolous ones: I'm patched up to the latest skyrim version w/ Dawnguard. So far, I ONLY crash at the Bee and Barb. I haven't tried other inns yet or other shops for that matter, I'm pretty sure the Whiterun inn does not crash. The only other problems I've had since the new install were freezing up once as I was blacksmithing, and one other crash to desktop while in showracemenu and that seems to have been a fluke because it hasn't happened since.I also do not have an ENB installed or any texture mods active atm, not until I get this problem figured out. I bumped this thread in the hope that one of the OPs might have found a solution and hadn't shared it yet.