Thank you for your reply. We did confirm the BIOS was up to date, and that all applicable USB options were selected in BIOS. We also tried the USB3.0 plugs ONLY, but still got the same failure.
We tried a few other things, including running (3) USB3.0 plugs on another PC (Dell Lattitude Laptop w/ 64-bit Win7 OS) and got the same failure (Software Exception). We could run (2) USB3.0 loopbacks, with other tests selected, just fine... but when we added a 3rd (USB3.0), the error occurred. We did have them all connected to a SS (Super-speed) port, and the loopback LCD read out the voltage and 5GB/S speed.
What ended up working for us on the Dell T5810 was, running the USB loopback test ONLY (with all 8 connected) without any other tests (i.e. CPU, RAM, Disks, etc.) selected in the configuration tab. Seems as though the USB3.0 loopbacks have a 'longer' startup time then the USB2.0s (and/or consume a higher power)... not sure if that has anything to do with the failure or not.
So, I guess we are 'good' for now... we'll just have a separate script for the user to execute to run the USBs (all

Thank you for your time.
Gregg
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