Expert Mouse on Nano H4 PC

I keep reading about success with the Kensington Expert mouse on the RH4 but can't seem to get the mouse to be compatible with the Hog4 PC. I may be missing something though. I'm running on Windows 8.1 with drivers for the Expert mouse but outside of H4 software do I need to set buttons 3 and 4 to give a certain command before it will recognize it in the software?