I am using the (built in) physics engine.

Sometimes, when i roll over a flat area (with my character, the blob) the ball just stops. so i press escape and this shows up:

'acknex.exe - Application error'

'the instruction at "0x7c910717" referenced memory at "0x00c73c75". the memory could not be "read"'

'click OK to terminate the program'

I have never had this type of error from acknex before..
Any ideas?