[Visualpython-users] Errors running Vpython on OSX

Greetings.

I've just started using VPython on a linux box and got completely hooked
and started dreaming up all these great demos that would be possible.  
The problem is that we're on a Mac campus, so I needed to get Vpython
running on OSX. I followed the instructions and everything seemed fine
until I ran the demo programs.  In any of the demos where there is 
animation (double pendulum, Lorenz, etc), the program bombs at some point
(not always the same) with a message like:

Traceback (most recent call last):
  File "doublependulum.py", line 71, in ?
    atheta2 = -(A*atheta1+C*sin(theta1))/B
ValueError: unexpected math error

The programs can bomb at different locations (there seems to be no pattern
that I can see).  Sometimes, the demo will run for 15-20 seconds before
quitting, sometimes shorter.  The real crazy thing is if I put a trace
statement just before the offending line and print out the values to the
screen, it doesn't bomb for a VERY long time (half-hour or so), though it 
slows down the animation.  It then finally bombs with the following message:

OverflowError: (35, 'Resource temporarily unavailable')

Which seems different than the previous one.  Needless to say, none of this
happens in Linux, which makes it doubly frustrating, since I know it works,
I just can't show anyone.  I haven't had time to really try and debug this,
so I was just wondering if anyone's come accross this and fixed it (I didn't
see any mention in the email archives though).

Thanks for any help.

Chris

--
Chris Burns
Visiting Assistant Professor
Dept. of physics and astronomy, Swarthmore College
cb...@sw...      http://hven.swarthmore.edu/~burns