Got CTD at the exact moment when Dawnguard Crossbow is equipped and unsheathed, by player or by NPC.
Spend quite some time figuring the cause...tried switching off dozens of mods but nothing helped, finally I remembered that I've used DDSOpt to optimize vanilla Dawnguard textures and repack them back into Dawnguard.bsa according to this guide.
The crashes were gone when I restored original Dawnguard.bsa from the backup.
I also tried to rebuild Dawnguard.bsa again to make sure that I didn't missed anything, but it still crashed.
Guess it should be mentioned in the guide that one should never repack mixed vanilla BSA archives with DDSOpt or he will get a CTD. Loose files shall be used and original mixed BSA archives to be left untouched.
At least until tool is fixed.
