Ah, you have "SW snaps on mouse hover" turned on... well, I still don't see your problem, because when you click an item it's entering a "different mode" than when you're just hovering the list with the mouse pointer... as soon as it leaves the viewer-widget it enters "hovering mode" again. I wouldn't like to change that a) because I remember it was hard to make it work cleanly in both modes wink and b) because it's consistent with the way it works when "SW snaps on mouse hover" is turned off.

A mind is like a parachute. It doesn't work unless it's open. [Frank Zappa]