in Vegas Pro 21, build 208, I made a project of 5 hours and 10 minutes, rendered it Magix AVC/AAC MP4, 25p, and on the resulting material after an hour and 15 minutes, I have no sound !! Before the sound disappears completely, 1-2 minutes the sound has interruptions. I then rendered on the other work computer, the same Vegas Pro 21 build 208, and amazingly, the result was the same. I tried again on the first computer, the result was unchanged. As the project was done in Vegas Pro 21, I couldn't open it with previous versions, so it took a lot of work and I redid the whole project in Vegas Pro 19, and it worked! I specify that the video material comes from the Nikon Z6, mp4 50p. The whole thing delayed me almost five days and the client was very unhappy about it and I had to give him a big discount. I am also very dissatisfied, I bought absolutely all versions of Vegas Pro from version 13 to the latest, version 21, I kept hoping for an ok software, but unfortunately, all versions have problems. I think I'll change the boat.