I have a multi-monitor system, with 3 Samsung displays on two Nvidia cards under Win 7. All are reasonably color-calibrated by eye because it bothers me when displayed pages change color when moved across the desktop. When I straddle two monitors with a browser, or Word, or pretty much anything, the colors (including whites) are pretty close.
But Windows Photo Viewer throws a peculiar yellow tint over its entire display, image and background alike… on only two of the monitors. Each monitor is hooked to a different video card. The center (main) display shows a white background and whites-as-white, but on the two side monitors, WPV throws a strong yellowish-sepia tint on what it’s showing. I can straddle two monitors and have white/normal on the center display and the yellowed display on the sides at the same time another window is showing balanced whites in both halves.
I ran across an issue with windows photo viewer in win 7 having some color balance issues. If you are experiencing what my customer was, its a bug in WPV. I loaded up picasa used that as the default photo viewer and everything was fine.