OK, problem solved! After reading your last post, I decided to make another attempt to burn a DVD disc. When I opened Toast, I looked at the first page and believed that having it on the first choice, "My DVD," was a mistake. I clicked on the second choice, "DVD-Video," and that allowed me to burn it in the Universal Disc Format. And yes, it played in my Samsung player. A couple of days ago I left a message with tech support and followed up with them yesterday but they never got back to me. I'm happy to say I solved this problem with your help and without tech support's help!
Thanks for your big help!