My guess is that your MIDI channels are not lined up properly. In Kontakt as well as every other VSTi instrument that I have you must select a MIDI channel for both input and output. For example if you have BiaB's bass on channel 5 but your Kontakt bass is set for channel 1 you will not hear the bass. So make sure that each BiaB output channel matches Kontakt's input channel.

Whenever I get something stuck in the back of my throat, I dislodge it by drinking a beer.
It's called the Heineken Maneuver.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware