Hello Perry,
This may be caused by old firmware on the ConnectX-3 adapter.
The firmware should be at least 2.32.5550 for ConnectX-3 adapters.
I recommend updating the adapter fw to the latest version which has improved compatibility.
You can see the current firmware version using the vstat command.
The WinOF driver supports the 64 bit version of Windows 7 only (not 32 bit) with no virtualization ( no SR-IOV).
Also, if the switch is running older software that could prevent it from linking with certain adapters/switches.