strange keyboard behavior on screensave

[Claude Jones]

Running KDE47. 
When I leave the computer for a sufficient time to let the screen 
saver kick in, a shake of the mouse reveals the basic login dialog 
with no background. If I attempt to enter my password into the 
field, no characters appear and the login fails. However, if I do 
a Ctl-Alt-Bspace, X is restarted and the full background pic is 
displayed along with the log in dialog, and it will accept 
keyboard entry...

Ideas, anyone?
-- 
Claude Jones
Brunswick, MD, USA
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