Been using a lot of MIDI CCs coming out of the Digi, but haven't touched G or H until now. I just tested G and H, they're working fine here (manual and LFO control). I used the following settings:
Midi Channel 10
G - CC9
H - CC3
My Digi is connected to an Endorphin.es Shuttle control via USB. I monitored the MIDI output too and things are looking fine.
Have you tried a fresh pattern or project?