CairoWin on Windows 7 doesn't refresh

I'm trying to use the Cairo package (R 2.15.1) with Windows 7.  If the
graphics device window is behind another window, when I move the
graphics device window to the foreground, the contents of the window
are not refreshed, and continue to contain the image of the window
that was on top of the graphics window.

Anybody else experience this?

Kevin Wright