Header and Footer disappear when resized

Hi Catch themes Team, First of all, I really love your wordpress themes and used them for 2 pages already. Nevertheless I encountered an issue with the Simple Catch Theme which I'm unable to resolve. When you resize or minimize the browser and use the scrollbar to scroll to the right the header and footer section background disappears. It shows up fine if you resize the browser or maximize it again but it doesn't like scrolling. Anything I could do to fix this issue? This behaviour is reproducible on the simple catch demo page so it's not related to any customizations. http://catchthemes.com/demo/simplecatch/ Any help is greatly appreciated. Thanks Deadwalker