On my quite up-to-date Aranym/FreeMiNT/XaAES system I can't quit XaAES 
to return to my MiNT login console. And I can't showdown or reboot 
cleanly from the XaAES taskmanager. Except for the new configuration 
options and dialogs for killing apps that are running, the "greatly 
improved" shutdown functionality in the latest XaAES versions from CVS 
are no improvement on my Aranym system.
Opening a Toswin2 shell window, and typing "shutdown" works best for me.
I haven't tried on my real Falcon030/CT2b yet. Will probably work better.