When started from the menu, it comes up but lock up as soon as you try to do anything, such as search for a known file (Thunderbird for example).
If run in a terminal via sudo synaptic itnimmediately errors saying that it appears that you are running as root in a wayland environment. As far as I can tell only the xorg/xserver environment is the only thing running.
Dietpi is the latest version (downloaded a week ago).