Thumbnails not showing only in featured image window.

Have you tried:

– deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).

– switching to the default theme to rule out any theme-specific problems.

– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.

– re-uploading all files & folders – except the wp-content folder – from a fresh download of WordPress. Make sure that you delete the old copies of files & folder before uploading the new ones.

Yes, I’ve deactivated all plugins.

Yes, I’ve reset the plugins folder.

Yes, I have tried using the default theme.

Where would I download those files to reupload the WP files?

https://www.ads-software.com/download/

And so, I’ll reupload all files EXCEPT the wp-content folder?

Correct.

I’m having the same problem. I just upgraded from 3.4 to 3.5. I’ve tried 3.5, 3.51, and 3.52. All of my media seems to show up everywhere fine except when I’m creating / editing a post or page and click on “add featured image”. When I do that, none of the thumbnails load on the popup.

I have tried deleting all of the plugins and using the default theme with no luck. Anyone have any ideas what the problem could be?

@michaelwalden – Please start your own thread per https://codex.www.ads-software.com/Forum_Welcome#Where_To_Post

Here: https://www.ads-software.com/support/forum/how-to-and-troubleshooting#postform