I had the same problem as you before... the problem comes from DBUS
If you start Evo. in command line you will have the following error:
libnm_glib_dbus_init: error, org.freedesktop.DBus.Error.FileNotFound raised: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory
Simple start the messagebus service...
service messagebus start
restart Evo., and everything should be fine...
Cheers,
ROm