I have a problem. I have burned video DVDs using SonicMyDVD. These DVDs work perfectly fine on my set top DVD player and my DVD burner which recorded the DVD. However, when I try and watch it on my friends DVD-ROM I can watch one chapter and when I go to the main menu to choose another chapter it freezes. What is happening? Also, do different DVD player/DVD-ROMs read DVDs at different speeds?