Hi Mordy and thanks for contacting the Cow Audio Forum.
Nice description of your situation. Plenty of details.
Sounds like that adapter cable may not be the one you want for that job. I know you said it used to work in the past, but XLR to 3.5 mm can be wired differently.
If the cable is for a balanced audio connection, the tip, ring and sleeve are wired one way. If the cable is for unbalanced audio, the cable can be wired another way. If the cable is for a stereo unbalanced connection, the cable can be wired a third way.
I forget if there are any wiring difference between the G2 and G3, but that may have been the problem.
Regards,
Ty Ford
Cow Audio Forum Leader