I fired it up this morning and audio export is there and working… I made no Mac Pro changes or updates. It was restarted, but I’ve been doing that a lot the last couple of days with no effect. I’m shooting in the dark, but here are the only things from yesterday that are memorable:
A) I resolved a persistent Play6 locking up problem by invoking “Load Sounds for unassigned instruments”.
B) I didn’t run Pro Tools or Sibelius today.