I have been using Vegas pro since version 9, and find the software to be very good. However, when I moved up to Vegas 11 I have experienced a constant flow of minor problems. Getting excessive "Vegas has stopped working" messages where the software would close and not save the changes I made in the project, or the current issue of rendering a file, then adding titles and music and re rendering the file only to get an occasional frame where the color of the sky is yellow or purple.
I have never encountered these kind of problems with Vegas Pro in previous iterations and have contacted Sony support a few time regarding these problems, but haven't gotten any real solutions for these problems. I have gone back to Vegas 10 for critical work and keep checking the Sony website for the next update for Vegas hoping that they have addressed the problems that keep going back to them through the error reporting tool built int Vegas 11