Whether I use DVD2One or Toast 7 to burn DVDs from VIDEO_TS folders, lately, I've been getting warnings with crazy numbers of mastering errors (anywhere from the high hundreds to two hundreds). The DVD will burn, the main menu will come up, but then the time will rapidly advance (skip ahead in chunks of time) and the video will not play. I can, however, use Toast 7 to burn an .avi or .mpeg or .mp4 (etc) to a DVD. (I prefer the VIDEO_TS because I'd like to be able to have a fully featured archive, not just the video.)

Does anyone know what's going on?

I've run the disk utility (repaired the disk permissions) and verified the disk (did not have to repair the volume).