Hmmm - good responses all around. Thank you all for your valued feedback. Perhaps it's too may 'if' statements under the for XXX in range(x,x,x) statement as most of the 'if' statements appear there. It could be something entirely else. I'm afraid its a bug with Python, (if I try and run it several times it keeps going to the IDLE console prompt and it eventually crashes out of Python entirely).
Some useful suggestions were provided in terms of better design so that may be my route at this point. Thanks again for all of your help! -- http://mail.python.org/mailman/listinfo/python-list
