Channels 9 - 10 not working? Anyone?

The Overbridge Control Panel shows me healthy signal from my Rytm on all channels, but nothing comes into inputs 9 - 10 of Ableton. I can’t find the origin of this problem. I really need to record all 8 voices in real time. Does anyone have the same issue? As far as I know my setup should allow 8 channels in 16 bit.