OpenMW Combat AI (often) breaks quest
In Bloodmoon, there is a quest where you're supposed to help an NPC defeat an enemy without you attacking said enemy. This relies on a script (ValbrandrDraugr) which checks every frame if the enemy's health has decreased and advances the quest to a fail state if it detects that the NPC hadn't hit it with his sword that frame. This is rather flimsy as you can imagine, and causes problems when playing OpenMW: the NPC's combat AI chooses to cast a frost shield spell from his sword before attacking the enemy, making every enemy blow on the NPC fail the quest. This is really Morrowind's fault for not making the script more robust, but it is arguably a compatibility issue.
Tested on Windows 7 with the 0.45.0 RC.