Is this normal? [broken physics after upgrading]

Unity Engine
1

Hi

I have this game im working on in Unity 4.3, today I decided to upgrade the project (I made a copy) but to my surprise the player character starts rolling on itself as soon as it touched a Mesh collider, this didnt happend to me before Im using a rigidbody to move the character, and the character has a box collider (is a Tank) and the center of mass at -0.5f
Here is a video of the problem:

I have a deadline for tomorrow so Im a bit of a hurry to fix this… :face_with_spiral_eyes:

2

The Unity 5.0 physics system is a big upgrade. If you have a deadline just revert.

3

Here is the thing, the level designer made the level in Unity 5 by mistake, he didnt knew we were working on an older version so If continue with the 4.3 version of the project I dont have a map. Its clear we wont make it for tomorrow’s deadline but I would like to know how to fix it anyways.