I currently maintain a wiki where I am the sole sysop and editor, but the wiki is publicly accessible for read-only access. I'm not sure how long this has been going on, but I've recently noticed that when I'm not logged in, I'm starting to get "Error creating thumbnail: Unable to save thumbnail to destination" errors on pages that contain images. This sounded similar to some recent messages I've seen on the list about thumbnails not working, so I started doing some digging. What's *really* interesting is that, as soon as I log in, the images start working correctly! The effect is completely repeatable: If I log in, the image displays fine; once I log out, the thumbnail error reappears.

Naturally, I've already checked to make sure ImageMagick is properly installed and working correctly; after all, it's creating thumbnails fine when I'm logged in. I've also checked the file permissions to my images folder and it is writable by the Apache user/group. What baffles me most is why the thumbnails would work fine when I'm logged in, but fail when I'm not; from the web server perspective, permissions shouldn't be an issue since everything would be operating under the Apache context. Clearing the file cache (php rebuildFileCache.php) and the images (php rebuildImages.php) has no effect.

MediaWiki: 1.27.0 PHP: 5.6.15 (apache2handler) MariaDB: 10.0.21-MariaDB ICU: 52.1 ImageMagick: 6.8.8.10

Any ideas?

Jeffrey T. Darlington General Protection Fault http://www.gpf-comics.com/