Hmmm, wonder if my update problems were related to this thread?
http://line6.com/support/topic/1314-hd500-firmware-broken/?do=findComment&comment=49819
I have a stomp box running with a power adapter in the loop of my HD500. Both are plugged into the same power bar. The power bar plugs into my Furman power conditioner which is what my PC is plugged into so maybe I have a ground loop problem running through my USB? The update worked after a couple of tries so it will have to wait until the next upgrade to see if that is a solution.
Cheers,
jayson