I had the same problem.
I replaced:
$avatar_url = plugins_url('/user-avatar/user-avatar-pic.php')."?src=".$avatar_src ."&w=".$width."&id=".$item_id."&random=".$file_time;
With:
$avatar_url = $avatar_src;
Reuploaded, cropped, and was up and running. Dev may want to consider patching.
