I just ran a physics example here:
And hinges seem to be okay.. could you reproduce the physics errors in new .cap files?
It's happening in Tonks, which is rather complex... so, chances of reproducing in a clean cap is not going to be easy. It all seems to be tied to the first event though... START OF LAYOUT > MAKE HINGES ETC.
I'm not really sure what is going on exactly, since the treads are not even hinging, and the wheels completely vanish, when at start of layout they are meant to move to the players x.y position for each wheel then hinge.
If you want to take a look at the cap, you can get it here:
In the meantime, I guess I'll try to make it happen on a clean cap or something. :/
It appears that, if you set a physics objects X or Y position via events, then try to hinge it, it breaks... this never used to be a problem before. If I turn off the random force position for the tank chassis, the wheels stick, but the treads still break since they are coded to "move to position" then "hinge".
Hope that at least helps to find a solution.
It also seems if you spawn (create object at x.y) a physics object at specific X and Y coordinates, and try to hinge it, it also fails to work properly...
It all seems to come back to setting X and Y coordinates for physics objects in one way or another, regardless of whether it is "set position to" or "create object at".
Hope that helps a little more...
Ill still try to make a cap demonstrating it so I can upload to the tracker, unless that's enough info to work out what's going wrong.