B
On Oct 5, 2015 19:21, "Timothy Murphy" <gayleard@eircom.net> wrote:
>
> The one serious problem with F23beta is that it sometimes freezes,
> refusing to accept any input.
> I have found no way of waking it except pressing the power button
> for 10 seconds and re-starting the system.

Have you tried:

https://bugzilla.redhat.com/show_bug.cgi?id=1217844

ALT-F2 (krunner):
kquitapp plasmashell ; plasmashell

if not, try harder:

ALT-F2 : killall plasmashell ; plasmashell