I'm seeing an interesting effect on OS X Leopard with Safari 5. If I bring another program to the foreground on top of the Safari window, and then switch back

I'm seeing an interesting effect on OS X Leopard with Safari 5. If I bring another program to the foreground on top of the Safari window, and then switch back to Safari, only the shadows and background color appear. It takes a second or so for the white boxes and text to appear, as well as the chrome around the top portion of the window. This was repeatable several times at first, but now it's become intermittent. It takes me back to the days of tweaking settings in X-Windows, when there was a "saveunder" setting that would specify whether to retain the contents of a window in memory when it became obscured by another window.