Hi All! All of a sudden, I started having a problem in the old LightRoom (v5.x) on Windows (10): Any adjustments I make are not shown on the photograph shown in the middle of LR workspace. Also, it doesn't show any changes in the preview panel for sharpening and noise reduction (under "Detail"). Also, sometimes, if I am making image adjustments, LR stops showing the active image at all, with only the grey frame as a place holder. I have already tried to move away Lightroom 5 Preferences.agprefs file in C:\Users\{Username}\AppData\Roaming\Adobe\Lightroom\Preferences thus allowing LR to regenerate it with the default settings. That did not help. Here are the things that have happened since everything worked just fine: 1. Computer crashed during a power outage. I do not remember if LR was running at that point or not. 2. Windows 10 update was installed. And the first symptoms were that LR was not showing on the imported photos that a smart preview was active. Also, sometimes, it was not showing So, I've created a new catalog, removed the preference files, - and the smart previews started working again. But the changes are still not shown on the photos or in the side panel "Details" - for sharpening and noise control. Also, sometimes it shows just the gray frame instead of the photo. I have to move to a different photo and come back to load the image. I am torn between two possible reasons: something got damages in the installation, and I should reinstall, or, something changed in the Windows libraries/API, and that prevents LR from showing the images properly. Has anybody heard about this type of problems? Any ideas would be appreciated. Thank you, Igor