Joel -
Never hotplugged Mbox. Don't know what that is, but I'll google it.
And I did try plugging in my external Glyph hard drive to the card and it wouldn't work.
I"m running that through the USB 3.0 onboard port for now.
I activated the onboard 1394 port on my motherboard (ASUS P6X58D-E) and plugged the MBox into that and the problems went away. Same cables, same everything; the only thing that was different was the card.
I would use the onboard firewire except that it has a VIA chipset.
This is what I'm going to get..
https://www.sweetwater.com/store/detail/FWCardPCI
Thanks for your reply!
MIke