After 30 minutes on the phone with MS support the best they could offer was a registry tweak to disable modern authentication, which did allow the user to sign in and use outlook, but I consider that a workaround. Showed up the same in safe mode and when trying to create a new profile. And all files live in the Adobe 1998 color space. The modern authentication window was just a blank box. Although generally in the 200 to 500 mb range. I have a 4x5 scanback camera that generates very large files, and final flattened files will be from 200MB to 1.xGB. I think the one common denominator is that all the tif files are large. It's as if the OS is generating the icon every time you open the directories, so even fixing them isn't permanent. So, all files are created in PS, although I've saved files in GIMP after making a non destructive change to see if that makes a difference, and although the icon preview may come back, and often does, after some time it will revert to a generic icon. I can live with that, although seriously, 16 bit image files have been around for decades now. To answer your question: Tifs are generally 8 bit, and I do recognize that changing a graphic file from 8 bit to 16 bit does in fact cause preview issues, especially for files over 500mb. It happens on 5 machines in my office, so surely I can't be the only one. Apple blamed it on Adobe, and Adobe blamed it on apple, and after a couple of years the subject went away. It happened at the same time that the icon preview in the title bar turned into a generic blank icon (not just for tifs but all files). If you still see a blank screen after about 20 seconds, contact Apple Support. Press and release the power button, then immediately press and hold Command ()-R until you see an Apple logo or other image. For some history, this started a few years ago, it's been a long time, but it's a thing that sometimes really really gets to me. Press and hold the power button for about 10 seconds.
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December 2022
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