I was machining a large (30 meg) file, and everything stopped about 1/3 way through (approx. line 517,000). Reset light was flashing, and "Driver Watchdog Triggered" was indicated at the bottom.
Is there a problem with loading large files?
FYI, here's the answer (Email message from Art):
Turn off the watchdog in config/general. If the CPU gets too bogged down
that error can occur, you may want to also turn off toolpath display if a
file is longer than 20 megs or so.