Audio mixdown no longer working in cubase 12 Pro

since having a windows update this morning (Windows 11 pro, 64bit) I can no longer mix my tracks to audio, the audio file is empty ! The meters no longer activate when performing the mixdown. This has never happened before and its only since the windows update. Is this a known issue ? Has anyone else experienced it ? Is there a fix ?

AAAHHHH ! the update had reset my main audio out ! :tired_face: :exploding_head: :face_with_symbols_over_mouth: :face_with_symbols_over_mouth: