I wondered if my external HD was the culprit in my lockups and and crashes using Vegas Pro 9.0c and d. On a whim, I moved everything over to my internal HD and didn't have any problems. To narrow things down, I began to look into some of the newer external (and internal) HD's power states (hibernation) and hot swap ability. There lay the key for me anyway. It seems that by turning off the swap ability and making sure there was no power saving, that cleared up my problems.