The maximum number for RCR distances (the distance where GP3 changes from 3D shapes - the ones you edited - to 2D shapes - which cannot be changed) is 2147483648.
Gp3 changes from 3D to 2D to save system resources. On a modern PC the max number should present no problem.
Why 2147483648? Well, Larry (I think it was Larry O'Meara, but I could be wrong and it was the other Larry. In this case: sorry dude) posted the reason for this long ago:
2147483648 is 2 to the power of 31 or 2 Gig.
Btw, you can also change the RCR values with some editors. Still I would advice you to change it in GpxPatch, since these values overwrite all others.
Post Edited (10-21-03 20:05)
REHAB IS FOR QUITTERS