PDF thumbnails are not displayed correctly in windows.
If within the Editor Preferences (Ctrl+K) under File associations, changing Preview Handler for PDF Files to Yes, does not result in correctly displayed thumbnails or PDF icons, it may be time to clear the thumbnails cache.
By default, Windows stores the images for thumbnail previews in cache memory so that it can redisplay the images quickly each time you reopen a folder in Windows Explorer (Vista and Windows 7) or File Explorer (Windows 8).
This tutorial will show you how you to clear and reset the thumbnail cache to force Windows to reload the thumbnail picture views into the cache again as needed as you open folders.
Once completed, restart your computer to finalize the process.
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