MediaBay - no sound?

Cubase 8.5
When selecting audio files in MediaBay, I don’t hear their sound. I click on the file, and also on the play button in the previewer below, but no sound.
I have to drag them into Groove Agent to hear what they sound like.
What can I do?

Hi and welcome,

Open VST Connections. In the Studio tab add a Monior 1 bus and route it to your main output. All Cubase previews are routed to this Monitor 1 bus internally. Then open Outputs tab and set the Stereo Out bus to Not Connected (to don’t get the output signal twice).

problem solved, thanks a lot Martin!