Wasapi 400.

Hi guys, i am in need of tech help. So basically everything was working normally some time ago, however one day i have decided to do a small dj session with the DDJ 400 aaand it is really weird, but no sound output is there! nothing happens when i choose sound output to DDJ-400 WASAPI, literally nothing, ive tried all that i could potentially think of. update drivers, update firmware, but nothing seem to help.. could any of you give me an idea please? perhaps some advanced settings required to play ?

when i select that option literally nothing happens... 

please help me...