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Following yesterday's (12-Jul-2017) update of Windows 10, the taskbar thumbnail previews are significantly blurred and less useful in recognising open documents, and distinguishing one open document from another using the same application; for example, distinguishing between open Outlook emails or Adobe Acrobat PDF tabs. This issue is close to, but not the same as, How to make Windows 10 taskbar thumbnail previews bigger? where Super User explains how to increase the size on screen of the preview thumbnail. Is there a parameter that sets the resolution, dpi perhaps, used by Explorer in its rendering of the thumbnail?

Screenshots:

Thumbnails for three PDF docs using Print-Screen pasted into Paint:
thumbnails for three PDF docs using Print-Screen pasted into Paint

Another thumbnail showing three Firefox windows:

another thumbnail showing three Firefox windows

Another showing a spotify window:
another showing a spotify window

G-Man Says 'Reinstate Monica'
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Martin
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1 Answers1

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We are experiencing the same issue on several of our workstations running Creators update, and pinpointed the issue to patch KB4022725.

As it is currently impossible to just ignore one single patch, we were forced to disable Windows Update for users who feel it is imperative to have proper taskbar windows previews.

EDIT: The hack to increase taskbar preview size addressed in this thread provides larger thumbnails indeed, but they are still scrambled. The problem actually appears to be with window preview images generated by the OS (as used for Alt-Tab task switching for example) rather than with taskbar thumbnails per se.

EDIT2: The patch also seems to break old applications, such as Adobe Illustrator CS, regardless of compatibility settings.

SPO
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