Grimrock

Pretty much what it says on the can. If you right-click (and hold) any of the Tapestries hanging on the walls in the Goromog Temple, you cannot mouselook. You can drag the cursor all over kingdom come and your view stays locked on the Tapestry.

Pretty minor, I know, but it's a bit jarring when you're trying to look around (or trying to turn with the mouse!) but you can't because the Tapestry is (somehow) interfering with you.

You've got to tear it to pieces anyway, so you can see if something is hidden behind it. After that, mouselook is going to work just fine