Can't record all of a sudden

I’m using an RME Fireface UCX II connected to DAT machine. I’ve been recording no problem. All of a sudden today I can’t arm the record button in Wavelab 13. When I press pause for sound to trigger recording nothing happens. When i hit the record button nothing happens. I’ve selected the correct ASIO driver. Anyone have any ideas?

Did you try to reboot?
Playback is ok?