mysterious progress bar

[Claude Jones]

I'm on fully up-to-date F18 using KDE DE. Regularly, maybe every few 
minutes, I get a rectangular progress indicator appearing on my screen. 
It only appears for a moment. It has a little monitor icon on the left, 
and vertical progress bars. It's about two-three inches wide and less 
than a half inch tall. There's no text, and clicking on it doesn't do 
anything. It lasts a couple of seconds and vanishes. What is it?
-- 
Claude Jones Brunswick, MD, USA