Thanks Meter 10
Join Date: Nov 2011
Location: Atlanta, GA Metro
Finally, A Solution
After multiple uninstalls and reinstalls of the HTC Sync Manager and a variety of other ineffective suggestions at the behest of HTC Support, it seems that the HTC One driver was not installed on my PC.
The solution was to update or refresh the driver in the PC Device Manager while the HTC One is connected to the PC by the USB cable
The path to the driver for Win 7/64 is: C:\Program Files_x86>>HTC>HTC Driver>Driver Files>Win7_x64
Then Double click the androidusb.inf file. Restart your PC and you should be good to go.
Unsuccessful attempts had been made to do this with the HTC One NOT connected to the PC.
Once the refresh/update was completed with the HTC One connected, a restart of the PC was required; and, once restarted, away we went.
It really took far too many contacts with HTC:Support to get this thing resolved!