Cubase 10.5 Pro and AXR4T Issue on a Mac running Catalina 10.15.7

Cubase 10.5 Pro and AXR4T Issue on a Mac running Catalina 10.15.7

Boot Mac Catalina 10.15.7

Check Audio Midi for Thunderbolt Precision Driver Selected for Input / Output.

Load Cubase

Before selecting a working template I find the Mac Audio / midi output now shows Sound Output = Built In Sound Input Steinberg AXR4 2TR

Cannot reset these in OSX Audio Midi Settings.

Quitting cubase resets to selected driver Thunderbolt Precision Driver

Anyone seen this? (Presumably only effecting AXR4 interface users as that’s where the Thunderbolt driver is linked to.

Id guess this may be caused by a corrupted Cubase preference file but where do I start?