Some more data:
The PC having the problem sees the device with a PID=0x00f3
A PC not having the problem sees the device with a PID=0x4720
Does that mean anything to anyone?
The control center looks for the 0x4720.
The CYUSB.pdf talks about expecting the PID=0x00f3
Problem PC is Win 8.1 and sees PID=0x00f3
Non-problem PC is Win 7 and sees PID=0x4720
I successfully ran this morning my same Visual Studio C++ program under Windows 8.1 with my customers prototype hardware . The cyusb3.sys driver version that worked for us is 22.214.171.124.
Not having any success previously getting the previous driver 126.96.36.199 to working I purchased the SuperSpeed Explorer Kit.
The driver that worked was installed using C:\Program Files (x86)\Cypress\SuperSpeed Explorer Kit\1.0\Driver\bin\Win81\x64\cyusb.inf from the SuperSpeed Explorer Kit.