I have noticed that a lot of animations that were working fine in Unity 5 about 6 months ago, are now not correct in the latest Unity. I have quite a few animations like this, since they have gone bad the character leans forward 45 degrees and one of their arms stick out twisted behind their back. The animation that I just noticed this on was working fine (comes from the republic assets on the store - StandingIdleLooking) and is set up with rig-> humanoid. What could cause an animation that was perfect to suddenly be like this ? I have noticed a number of my mixamo fuse and poser animations also do this now too.