I have a very annoying bug where coach is always invisible, in cut-scenes and in general. The level of stupidity is really annoying as people literally sit in the air and horses pull them. Anyway to fix this?

I have a very annoying bug where coach is always invisible, in cut-scenes and in general. The level of stupidity is really annoying as people literally sit in the air and horses pull them. Not only that, I can't seem to leap in in some missions where hiding is required. Anyway to fix this?