Hinge Joint Still Not Fixed in Patch 3

this was promised for p1 or p2 but still crazy in p3 why is this not fixed as bug was reported before patch 1? how long do i have to wait to upgrade my old projects into a working unity 5, this is becoming a boring process and slowing game productivity when i cant move projects to unity 5. please fix it soon

here is the constant error i am getting:

transform.position assign attempt for 'Vert2' is not valid. Input position is { NaN, NaN, NaN }.

NOT TO WORRY JUST FOUND THE PROBLEM PLEASE LOCK THREAD

for anyone with the same problem, here is the answer. just untick the preprocessing onn the hinge and it then behaves as it did in unity 4.x not sure why the preprocessing is automatically on when importing a unity 4 scene but that was the problem.