Hey Triryche,
well I haven't testet a new cable, but the problem appears before connecting the unit already after installation of the driver.
for a moment, monkey and gearbox detected the unit, but when I tried to change the sound bank the unit ran down, startet again and so on.
I switched it off and on again, but it wasn't detected anymore.
I'll will try a new cable, but the driver installation problem is still there, I guess.