What is your audio bit depth set to? (preferences/driver settings/audio driver bit depth). Try setting it to 16 if it is not there already.
In Platinum, what happens if you choose ' wasapi exclusive' mode? On one of my devices, once exclusive mode was introduced wasapi shared mode no longer worked. It scanned as not available just as you describe.
Has wasapi mode ever worked on your system? Are you running windows 10 or windows 7?