It sounds like your ASCOM driver did not install properly.
You can get the latest one for the G3 here:
http://www.telescope.com/assets/prod...aller2.3.2.zip
This install package includes both the updated v1.7.2 of the Camera Studio, and the ASCOM driver for the G3.
I checked recently and the firmware on my G3 is apparently up-to-date.