Catch Responsive Featured Slider Navigation – Arrow img missing

Hello, I´ve been missing the left/right arrow in the slider navigation. The dots are shown correctly but the arrows are symbolized like a broken image or something like that. In each browser different if you move the mouse over the slider image. 1. Firefox: square with F430(left) and F429(right side) 2. Chrome: emtpy square 3. IE: nothing just the dots Following CSS is added in the customizer to change the color of the dots: /* Active dots */ #feature-slider .cycle-pager span.cycle-pager-active { color: #404040; } /* Regular dots */ #feature-slider .cycle-pager span { color: #7A7A7A; } Website: http://nest-electronics.com Is there a solution to show these arrows correctly again or remove them fully? The dots for navigation should be stay. Thank´s very much in advance.