Switch User Fails on Greeter console

I am running 11.4_64, KDE47 (recent update from 46)
I have three Suse Linux pcs on my network.
I’ll call them desktop, media center and laptop.

I am logged in to my desktop , I want to open a new session and log in to my media center.

From GUI, I select application launcher - leave -switch user and get a fresh kdm greeter screen.

On the Greeter screen, I select Menu - Remote Login
A window opens displaying three machines - my desktop, my laptop and my media center.
When I move the mouse into the new window to select the media center as the new target machine, the window immediately closes.

I have Xdmcp access enabled in kdmrc on all three systems(and rebooted).

This did work fine back when I was on KDE45 and KDE46.

Is there a new permission or setting now under KDE47?

After performing a (somewhat) controlled test on an additional machine, I found that the Remote Login worked fine from the KDE46 Greeter but fails when the KDE47 upgrade is implemented.

Logged a bug
**Bug 715265 **

I looked on the KDE bug site, did not see anything reported, so started with SuSE bug.