Ubuntu 14.04 (LTS) Host, VirtualBox latest release, phpVirtualBox latest release, corresponding to version 5.

I am able to RDP to the host with the port specified and access the VM.
In the "Details" page, the tiny box shows correctly what's going on in the VM.
When I go to "Console" page, I get this error "SECURITY_ERROR #2048".

Any ideas?

I was looking into VirtualBox and Proxmox, and Proxmox offers the SPICE HTML5 viewer. I love being able to "see" the VMs directly, that seems about the only feature missing from PhpVirtualBox. It seems like something that should work, since the tiny window in the "Details" page seems to know exactly what the GUI has. So why not via the console?