I’m still on iOS6, but am using Cubasis 1.6. I wonder if it’s due to the upgrade from 1.5 to 1.6. I never tried Cubasis to Cubasis recording with Audiobus so don’t know. On other forums, I’ve read that a workaround is to insert an app into the effects slot of Audiobus and then switching off the effects, but I’ve not tried yet as I don’t have any effects apps.