Hello! Who can help me? My Navi does not show any roads at the moment. (see picture) GPS functions work and the arrow moves. Routes calculation cannot be performed exactly. A reset with the Clear button (6 sec. press) without success. Three Navi-CD’S I tried from 2003 to 2006 (original) just without success. Maybe someone had the same problem. Thank you for advice. Radio is NCDR 2015. MfG Dirk