When I try to start an Auto Test or click Find Gauges button, I get a message saying no gauges were found.  Part of the error message says "Error 5: Access denied".

Your computer is limiting access to the USB ports by programs.  In order for FanTestic to access the USB ports on your computer, you may have to "Run as Administrator".  You will need to follow the procedure outlined in the attached document, regardless of whether you have Administrator privileges on your computer. 

This problem can be avoided if you have a DM32 by connecting the DM32 gauge using an Ethernet cable to connect the computer to the Network port on the gauge instead of using the USB cable.