Al,

I had excactly the same problem a few days ago which occured after l
had purposely tried to interrupt the code. On re-running the code it
kept stopping after a few loops of the code. Re-booted and same problem
occured.

I eventually put it down to a 'sticky' keyboard key, so took apart /
cleaned up the keyboard and voila! all was OK.

Hope this helps

Regards

Michael Beckinsale