Now that I think of it, I'm not sure if the entire computer hanged at reset or if it was just the Indivision remaining blank after, but surely I needed a power boot to get back into business. It stopped happening when I saved the settings and since several people ran into trouble when flashing the firmware and not saving settings, I assumed thats what happened to me. Either way, I haven't had that since.
See my earlier messages about ghost trouble. If possible, try another VGA cable.