The work PC is a Windows 7 machine, and when I plugged in the interface, Windows recognized it as a USB audio interface, however the machine did not have the actual M-Box (at the time) drivers, which provide some additional interface control parameters. I found that M-Box had sold that product and several others to AVID and driver support etc. was now through AVID.
I found the latest driver package for the Fast Track Pro, and downloaded and started the install. The driver install at some point advised me that the firmware in the box needed an update, so assuming that would be necessary for the driver to work, I installed the firmware update as per the instructions (all part of the driver install sequence).
All seemed to complete normally, however when power sequencing the interface as instructed, now I see that Windows does not even recognize the hardware... at all.
I started searching for a solution to the problem online (wish I had looked first), and found that this is a known issue with that driver package (which is still as of yesterday available for download and install from Avid) With that driver update you get one of two possible outcomes:
1) The box is recognized, but barely works. Noise, drop outs, poor audio quality.
2) The box is now a doorstop, not recognized by the host at all.
It seems that many folks have asked AVID for help, and the response is that "There is no way to update or go back to a previous revision of the firmware. Send us the unit and 100.00 and we'll fix it."
How thoughtful..

I also realize that I could have researched the driver before I installed it and saved myself the grief, however, when was the last time you did that??? If a driver is on the company's website and is the latest recommended driver, you have to assume that it is functional at the very least.
At this point I would absolutely never buy an AVID product. If they'll do it to you once, they'll do it to you again.
Just in case you have a working Fast Track Pro interface, DO NOT DOWNLOAD AND INSTALL VERSION 6.1.10 for Windows.