Can't open deconz GUI in VNC (docker)

After updating deconz to de latest docker image, I can no longer open the app in VNC. I can connect to the VNC but I only get a black screen. Right-click and trying to start deconz does nothing.

Phoscon web works, and all devices connect ok. But I need to access the gui to update the firmware on one of the devices.

Any ideas?