Hi, welcome to the forums,
You say that after editing the movie you go to share>create disc. You should not be trying to burn a disc with a project or anything in the timeline.
After editing you should go to
Share>Create Video File. Then render your project to a (PAL/NTSC) DVD-Compliant video file. Once that is done, close VS, then open it and do not add anything to the timeline. Then go to Share>Create Disc. Now click on the Add Video icon in the upper left, and bring in the DVD Compliant video you just created. Now proceed to create chapters, menus, etc continuing on to either burn a disc or create DVD folders or an ISO file.
This is explained in detail see the
Recommended Procedures for further information.
Also view the following
Read This First Sticky.
Thank you
Ron P.