hi!
had the same issue (g1/g0 not working, g2 working) with the version g2core-gShield-101.03.bin loaded and flashed from here https://github.com/synthetos/g2/releases/tag/101.03
I compiled my own version for gShield-Configuration with win7 64bit in atmel studio 7 – now it works as expected.
Was happy I found this topic, since I didn’t know what I did wrong – it seems nothing?