I’m sorry to say that I have not solved the problem.
Xabier, who also had this problem, tried reinstalling his entire system and couldn’t solve it. he went back to using CS4.
I don’t need to render mpg2 files that often, so I just render it out to uncompressed AVI take it to another computer that runs Vegas and use Vegas to convert the file to mpg.
FYI I did try to render the AVI in premiere and the mpg still has problems. so that rules out that the problem is in the project file itself