WiFi interface disappeared

[JimR <kd1yv oneyv org>]

Fedora Core 21, KDE spin, all patches up to date.

Have run for many months using WiFi almost exclusively. Started using OpenVPN a couple of months ago with a commercial VPN provider. (Not sure if that matters). That has worked fine.

Got notification from Apper that some packages needed updating, including kernel. Performed the update from the Apper UI.  I don't know if Networkmanager was in the list.

After reboot, WiFi no longer works, in fact, the whole WiFi interface has disappeared from ifconfig and from the NetworkServices UI. I plugged in an ethernet cable, and it works fine. Machine is triple-boot, FC21, Win7 and Ubuntu LTS 14.04. WiFi works fine in Win and Ubu.

I tried re-adding the interface, wlp8s0 using the Connection Editor. Seemed happy, but it still won't start nor  list in ifconfig 

I found this in the messages log around the time of the failure, but googling this does not produce any meaningful help:

Sep 12 23:16:04 KD1YV1 NetworkManager[733]: <info> (wlp8s0): device state change: activated -> deactivating (reason 'removed') [100 110 36]
Sep 12 23:16:04 KD1YV1 NetworkManager[733]: <info> NetworkManager state is now CONNECTED_LOCAL
Sep 12 23:16:04 KD1YV1 NetworkManager[733]: <info> (wlp8s0): device state change: deactivating -> unmanaged (reason 'removed') [110 10 36]
Sep 12 23:16:04 KD1YV1 NetworkManager[733]: <info> (wlp8s0): deactivating device (reason 'removed') [36]

Help!
JimR