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I have this issue and it started with the Windows 10 Fall update (1709). jpg files are not displayed in the preview pane but other files are displayed (pdf, docx, xlxs, etc.). I've tried setting the default jpg program to several different programs to no avail. Prior to the 1709 update, jpg files were displayed in the File Explorer preview pane. It seems to be an issue with the 1709 update.
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Interesting! When I posted yesterday, I believed the selection of Photos as the application to view had solved my issue.
I subsequently found it had for a number of files - around 40%.
I don't use OneDrive, and these were all fresh pictures I had just taken on iPhone and copied to PC.
Another thread suggested changing file ending from uppercase JPG to lowercase jpg; and after I did this I was able to preview all images.
What a muddle!
My problem is not related to file association, I've tried changing file association to multiple programs, including MS Paint. To clarify, my problem is with jpg files not displaying in the File Explorer preview pane and has nothing to do with file icons.
I've discovered the problem is related to the new 1709 update feature "OneDrive Files On-Demand". The problem with jpg files not displaying in the File Explorer preview pane only occurs for files that are on OneDrive with "Files On-Demand" enabled. I have some files & folders specified as "Always Keep on this device" and I expect files to be displayed in preview -- and they are except for jpg files. Other file types (pdf, txt, docx, xlsx, etc.) preview without issue. jpg files on disk only and not on OneDrive ARE displayed in preview, the problem is only for jpg files on OneDrive, even though "Always keep on this device" is enabled.
If "Files On-Demand" is enabled and "Always keep on this device" is not enabled (files are in the cloud only) then no files are previewed (makes sense).
I have another computer that was just updated to 1709. The "Files on demand" feature has not been enabled so all OneDrive files are on disk. It displays jpg files on OneDrive in preview without issue.
To summarize my problem as I see it... jpg files on OneDrive are not displayed in File Explorer preview if and only if "Files On-Demand" is enabled, even though those files are kept on disk.
Check which application is associated with JPG files. Right click on a JPG file, select "open with" menu option, then "Choose Another App" from the child menu which appears.
Ensure you are using the "Photos" application.
I suspect you have installed another graphics package such as paint.net and it has taken over the file assocation.
Problem is that Explorer need to get that application to render the image for display in the preview window, and if it cannot do so the preview window will remain blank.
Noticed the same problem since 1709. The option to show icons is NOT checked and never has been, although I look there every few days just in case. The preview pane is empty white for most JPEGs, but not all. No discernable difference in the files. What's more, since 1709, most JPEGs don't even show their thumbnails, just a generic white-and-blue icon. Again, not every JPEG, but most. To make the thumbnails appear, I have to open a photo by double-clicking (opens in Photos). But even then the thumbnail only survives a while. It's back to generic icons tomorrow.
Initially I blamed it on my user account, so I went through the laborious process of starting with a new user account, but the problem remains.
