I'm a photographer who occasionally creates very large files for printing onto canvas. I recently sized and saved a TIF file in Photoshop CS2 for a 32" X 22" canvas print; it looks fine in Photoshop, I can open it in Photoshop after saving, but the thumbnail preview generated by Vista can't display the image..just a gray rectangle with a black bar on one side. The file is big..over 550 mb..is there a file size limit / threshold in vista for how big the original file can be when generating the thumbnail? Or maybe the thumbnail generated is too large and can't be displayed?