Bro,...I appreciate you trying so hard.
I tried your method and installing the extension plugin.
At first i was discourage because it didn't seem to be working.
When I tried to insert it, I get this error message:
THEN... I decided to restart my computer.
After restarting, I launched gearbox and now it's working!!!!
I am using a Macbook Air with mac OS Sierra 10.12.6
All my drivers have been update including the flash update on X3.
So far this is working guys!