Fatal Error: Call to a member function thumbnailFixedShorterSide() on a non-object Yesterday at 11:14 PM - library/XenForo/Model/Avatar.php:263
Avatars are stored externally on S3. The S3 wrapper is initiated in index.php and the external data paths set in config.php. The S3 worked out of the box (unlike in 1.1.5) so I haven't modded that or use any relevant add-ons, such as Avatar as Attachment.
The avatars are uploading, just not getting cropped.
Also worth nothing that we run multi-server so their is no guarantee you will be on the same web server one call to the next.
Lastly running Imagick with pecl module 6.5.4-7 and imagick module 3.1.2 (latest stable)