I just ran into a strange problem. It turns out that when you try to upload a file using paperclip on IE, the content-type is different from other browsers and you have to take of them if you want to use paperclip’s
I needed to add to my model validation the following content-types: “image/pjpeg” and “image/x-png”. I did not have a problem with gifs.
validates_attachment_content_type :logo, :content_type => ['image/jpeg', 'image/jpg', 'image/gif', 'image/png', 'image/pjpeg', 'image/x-png']