VST vs AU) loss of audio outs since update

since updating i have lost full use of the AU plugin. It shows up in ableton and allows midi connectivity but if i want to split the audio channels from the master on separate audio channels i am no longer able to do so. using the Vst plugin this works fine (so far). Anyone else experienced this, has a way to resolve the use or has noticed any features lacking in the vst?

Same issue - but the vst is working fine with identical functionality, so I’m not overly concerned.

same issues since updating as well unfortunately. Anyone have a fix yet?