Device Panel opens for a second then closes and disconnects - Permission denied

[nunnsby]

Firstly, thanks for the container and your work here. This is a great tool, and very beneficial to all. 👏

I start the docker-compose with my normal user which is mapped to the docker group, so it has access to start the container. The container starts and I can access it via the web. I see the 3 VMs I have running on the host (the same host the container is running on). It shows the CPU graphs and they are moving, so all appears fine.

When I double click on a VM, the VM screen opens, but it shows:

Error connecting to graphical console. 
Failed to recv file descriptor: Permission denied.

It then disconnects from the host completely and I have to double click on the QEMU/KVM line to reconnect.

I can create a new VM fine. It starts and works fine too. Starting, Stopping and Deleting images works just as well, so it would appear permissions to the libvirt are working. Just when I open a VM panel, it has an issue, and kicks me out.

Running on Ubuntu.
I have privileged: "true".

Any thoughts?