I'm reinstalling everything on my computer. I have my old dvdarchitectpro6 file saved, but I see I can also download it from the Magix site. Is there is a difference? Is it an upgrade? Which is the better to install??
DVDA7 is what is supplied nowadays with Vegas Pro and VMS products. I assume it's an improvement on DVDA6 but don't have the knowledge to comment. Why not install both then you can make a personal decision as to which you prefer?
Version 6 was kind of notoriously buggy, Foskey. Its only advantage over version 5 was that it included an option to burn 3D BluRays -- but at the cost of a lot of buggy behavior.
I'd very much recommend either stepping back to version 5 or, better, moving to version 7, which includes all of version 6's functionality without its problems.