QUOTE (Mboufleur @ Sep 23 2008, 10:08 AM)

Yes... That's the version I'm using. I'm not familiar with the internals of DVDit Pro, but I presume there is some part of it responsible for up and dowres procedures - and then the encoder part (which is the new version you mention).
I downloaded 6.4 (latest version) and tried to burn my project again...this time successfully! It looks like upgrading to 6.4 (latest version) took care of all my problems. I also let 6.4 downrez my BD project and was pleasantly surprised how good it came out. So now I can successfully create both BD and SD dvds from the same project using motion menus with no problems. In a nutshell, here is how it was done:
1. From a 1440x1080 .m2t hdv file, I rendered a 1440x1080 .m2v elementary stream, as well as an .ac3 audio file using TMPGEnc.
2. Created BD project with motion menus and made sure the menus were under 1 gig. I kept my total project on disc under 23 gigs.
3. "Burned" BDAV blu ray folder as archive to be burned to BD later.
4. From the same open project, I changed the SD transcoding settings to keep the SD dvd under 4.3gigs total.
5. "Burned VIDEO_TS folder as archive to be burned to SD dvd later.
Tried burning BDAV, as well as VIDEO_TS. Everything works!
I archive both high def and standard def versions on a removable hard drive, and can easily burn whatever version the customer requires.
If there are any shortcuts to my workflow, please let me know as I did it this way via trial and error.
Thanks Scott for guiding me in the right direction!