Upgrading Unity to 5 threw off all 2d physics. Why? How to fix?

Was making a 2d platformer in unity 4.6 then upgraded to unity 5 and now my player and enemies seems to be slowly floating away. All the project settings are the same as before. Not sure exactly what other info in needed, let me know and I’ll be happy to provide it.

I had the same problem, and found out that the reason behind it was the animator. Animating with physics is somehow screwed up, at least for