The image in the header (Image Show GK4 module) is not shown on small mobile devices. On my phone it is shown in horizontal rotation, but not in vertical. What decides when the image is shown or not in the header?
Actually, the Bluap demo (http://demo.gavick.com/joomla25/bluap/) behaves like this. In vertical orientation on my iPhone the header image is not shown, while in horizontal orientation, it is.