F25: XFCE won't start

[Marco Guazzone]

Hello,

I've installed F25 Workstation x64 from Live iso (GNOME window manager).
Now I want to run XFCE window manager.

I installed it with:

   dnf groupinstall Xfce

Then rebooted and tried to log in (by selecting XFCE from GDM).
But after clicking on the log in button, XFCE seems to have problems and
the screen immediately comes back to the GDM login.

Any idea?

Thanks.

Best,

-- Marco