Hi! I think my problem is similar to this. When I upload an image or choose one from the media library only an image icon is displayed in the post. The image URL becomes: http://jaegeroslo.no/undefined. It works if I insert the image using HTML. Did you find a solution or know what causes this problem?
EDIT: In the insert media meny – the Link URL was set to None for some reason. When clicking the File URL, the images where displayed as they should.