Just upgraded to Vegas 13 today. So far I am really pleased. I can start it without it crashing, and when I call up the rendering dialog, I don't get that stupid memory error crash (at least not yet). I understand there are also some new features, but I am just tickled that it seems so much more stable!
Apparently, they changed over to .NET 4 and the claim is (amongst other things) that its much more stable than previously used. They also said code was changed to help stability in other areas too. So, if correct, then yes you should be seeing an improvement. Good luck everyone with 13. And good luck to the SCS devs who i know have been working extremely hard to get this finally working the way it should.
We will see...