[QUOTE=roguejestyr;9113091]first time posting, would like some help from all you knowledgeable folks:
Your brand of DVD is fine. Instead of shutting down the car just turn the nav off for 5 then reboot. If no better results, you will need another copy because that was most likely corrupt. I can burn you a copy of mine if need be. let me know if I can help out. 
PM or Spydeputy@gmail.com.