X3Photo Gallery Forums

I can't see that from here. What about in your main gallery (not the panel)? Do the thumbnails fail there also? It would be caused by one of the following reasons:

1. Your server does not have PHP GD installed (necessary for image resizing).
2. Insufficient PHP memory to resize the specific image dimensions (unlikely, seeing the file size).
3. Misconfigured rewrite rules (image requests use rules in the .htaccess file).

If you can send me the gallery link, I can check. Otherwise, please check your ?diagnostics page (add that parameter relative to your gallery url to see errors and missing extensions). You could also reload the page with Chrome developer tools open, and then click one of the failed images in network inspector to see better error messages.