Something broke mouse support

[Argoon]

Today tried to play Amnesia and was unable, because i couldn't move the view around, the mouse works fine in the menus but in game it just stops working, i can move around, jump, etc, just not look around.

This also effects mods.

After some googling found that starting the game using the _nosteam version of the exe the mouse works fine, but unfortunately afaik mods require the normal exe.