Almost a year to the day....."MY CREATURE LIVES"
This was solved a year ago - solution supplied by Propellerheads....Yes I did try an external USB hub, but that was because I had tried everything else and was at a loss of what else to try at the time. I did use a PCI USB card in the end - it was/is a problem with certain AMD USB chipsets....700 and 800 series.
I've since built an new I7 system, and don't need to worry any more.
BTW. I notice this was your first post - welcome to the forums.