I just plugged my JTV-59 into my POD HD500 using the VDI cable, and I got a green light under the tuning knob (the model knob was the usual orange colour). Monkey didn't recognise that it was there. Pressing or rotating knobs didn't do anything, so I unplugged and replugged and it went normal.
I'm not fussed as there's no ongoing problem, but I've never seen a green light on the guitar before.
Has anyone else had this or does anyone know what the green light is for?