Today I got my Half-Moon Mill crash. Couldn`t fast travel there nor walk at all. Like you mentioned no matter from which side I tried to get there, I CTD. After many tries, mods off one by one I discovered what was my issue - this mod: http://skyrim.nexusmods.com/mods/24511 - Forgotten Settlements. Check its files, remove all from ...\Data. Also if you`re using Dual Sheath Redux (http://skyrim.nexusmods.com/mods/34155) be sure, after you delete all Forgotten Settlements files, to run Dual Sheath Redux Patch.jar to get new Dual Sheath Redux Patch.esp (replace old one in ...\Data) or your Skyrim will crash at the menu. This was my issue, hope I could help.
