Hey.

I was just now working in Pro 3.3.3 modifying files and changing thumbnails. I then upgraded to Pro 3.4.3 and everything is fine, however, no matter what I do, thumbnails to files will *not* upload.

I don’t get an error message or anything, but all I see is a “broken” image link where the thumbnail should be when viewing it on the front end. Upon right-clicking and viewing the image, it goes to:
http://example.com/?wpfilebase_thumbnail=1&fid=813&name=thumb_name.png

With a blank page with text “file not found” or something.

Whereas previous thumbnail paths look like this:
http://example.com/?wpfilebase_thumbnail=1&fid=813&name=thumb_name-960×540.png

Also, when viewing wp-content/uploads/filesbase/, the thumbnail image file isn’t even there, so it’s not even like the path is wrong (which it still might be, since I don’t see the correct suffix) but the file itself isn’t being uploaded.

If I upload a new file with a thumbnail, the file is uploaded – but no thumbnail. If I edit an existing file to add a thumbnail, it also doesn’t upload.

What’s up? Is this a bug?

Thanks for any help.