How do you set the alt attribute with the Media module widget?
After one whole day of searching and patching without success I finally found out I only simply had to download and enable Token module to make Media correctly set images alt and title attributes when inserting images in CKEditor wysiwyg. I wonder since this is nowhere stated as an requirement. That's the bundle of modules it finally worked with:


media-7.x-2.0-alpha3
wysiwyg-7.x-2.2+46-dev + CKEditor profile (CKEditor 4.4.2.1567b48)
token-7.x-1.5


Now I even can use the default view mode to display the alt or title attribute below the image to use it as an image caption.