I have had a really weird USB issue that I have always suspected to be H/W BP6 defect, until I heard that my brother who was also running a BP6 dual celery w2k config had a similar (but not the same issue).
 
I am running the QQ Final bios, and the PCI/USB bridge works fine w/ MPS 1.4. However, I have a MSFT Natural Keyboard Pro 2port USB hub that will sometimes show up as a unknown USB device in W2K AND in Win98. Then it will mysteriously change back to a "generic hub" in the device manger, and stay in that state for a week, then boom, it becomes an "unknown usb device" and stay there for a while, then repeat. I couldn't find the trigger for the life of me
 
Even weirder yet, the upper USB port on board seems to work worse...
 
Now, I do have a Diamond Fireport that shares IRQ 10 w/ the USB controller (but it doesn't generate any conflict, and my SCSI devices work perfectly)...but after I flashed to QQ final, I have 128 IRQs (is that normal?) and no shared IRQs....
 
Now, any expert BP6 user can share some insight on this little problem that I have (anyone else?)
 
Thanks!