REboot / Shutdown options do not work


I have been digging around with my RPi and Volumio,but now the options to reboot/ turn off the device (al thought still available) do not seem to do anything.
I have changed the root password, but I have changed it back, and they still do not work.
SHHing into the device (via PUTTY) as Root allows me to reboot the device, but it would be good to get the web options working again.

What exactly does the weui reboot and shutdown options do ?
can anyone help ?
Is there any more info I can provide that would help diagnose the issue ?

Thanks in advance