I just upgraded to Vegas Pro 20 (version 20.0 build 139) from Vegas Pro 18 and I have encountered a problem not present in Pro 18. When using fairly aggressive settings in color grading I get a diagonal line of various colored pixels when rendering the timeline. While rendering, it is visible in the preview monitor and in the final rendered file. It is not visible while editing. The source material and final rendering format make no difference. Hardware or software encoders made no difference either. As you can see in the attached snapshot, this 8mm film needed some fairly aggressive color grading. Specifically, I was using the Auto Color Levels feature in this case. The Auto White Balance and other adjustments in color grading have less obvious errors, but they are still there. As previously stated, this did not present itself in Pro 18.