I had already been rendering my last few videos in 60 FPS, since I was preparing for the YouTube 60 FPS playback that had already been introduced. Today I managed to edit one of my videos, rendered it using the previous settings, and uploaded it to YouTube. It was processed, but unfortunately the 60 FPS playback option just wouldn’t appear. I looked into it and it turned out that Vegas rendered it in 30 FPS instead of 60, because the render profile had the setting that the source could also determine the FPS. That was a big mistake, but whatever, this video of mine will stay like this now 🙁