I have sq 6 and I have the same problem..Before on firmware 1.2.0 I could normaly playback trough USB B on chanel 23 24 ..(or any else wich I picked up)..
when I upgrade to firmware 1.3.0 problems start, then I upgrade to 1.3.1 and win drivers 4.3.5.0 .situation was the same..
Now i have the situation that I can”t use it as a sound card ..
Also if I put a USB stick to sq drive and want to play music from it ..it doesn”t work..
this is my fifth Allen Heath mixer that I”m using..I never had a problem…I recomended it to the guys on television..
Now my ass is like a train station everybody comes in and out as they wish…
Can you find the solution..
Thanks