OMG i thought it was just me, Im having the same exact issues. Except I use Native instruments maschine, when i tryed to open a project and play back the beat, It shows on the meter that audio is coming threw but you cant hear anything. i have tryed everything to get it to work. The only work around for now is to use your computers default audio drives when making music. but like you said the ausio driver is way better for lower latency.
If you figure out how to fix this please let me know
another thing, are your MIDI devices working right? cuz my usb midi keyboard wont work anymore