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Hello! As we remember from the Last Exciting Episode, I was getting a yellow cast on-screen when trying to calibrate my Mitsi 920 monitor on Win XP with PhotoCal and Spyder (real). So I very carefully made sure that Adobe Gamma was not loading on startup (apparently it DOESN'T under XP-- checked startup folder, Registry, etc) and reinstalled PhotoCal. I rebooted immediately and let the tube warm up for over an hour. I then connected the Spyder, followed instructions to the letter running PhotoCal and exited the app. I noticed immediately that my usual wallpaper looked brighter! I opened Photoshop, and saw that the neutral grey background looked much better, but again very light. I opened a file, and for a few seconds I thought the problem was fixed. When I compared the file to prints made on my 870 using known good custom profiles (from two different reputable sources)I saw that colors were closer to correct, but that the file onscreen was definitely lighter, and now shifted... to BLUE! Remembering that CD Tobie had suggested that XP only loads its LUTs on boot, I rebooted the box. Wallpaper was no longer too bright, but the yellows were very definitely back! Now thoroughly annoyed, I uninstalled PhotoCal and ran Adobe Gamma, keeping a neutral grey and a greyscale step wedge in the background. When I was done with this procedure, my files almost exactly matched the prints once again. (Note: the files and prints under discussion had been edited and printed on both Mac and Windows platforms. Results were excellent in all cases until the instrumented calibration.) I have emailed ColorVision concerning this problem. Thanks to all who helped me-- I have learned a LOT! I will post with the results of my contact with the manufacturer. Les - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.