Hi, i have the same problem.
The output works perfecly (i plugged headphones). i heard my metronome and some virtual keyboards.
But i can't record anything (from microphone or guitar). They is no signal at all. My cables are ok, i checked, The volumes on the audiobox are ok too.
I really don't interstand.
If someone can help me it would be great (sorry for my english, i'm french.