I decided to give a try to Vegas 16 and I'm disappointed again...
I have a project with 3 camera angles and before editing I converted every X AVC L files into MAGIX's Intermediete codec (1920x1080, 442, 25fps). I use a plus external monitor to see the different angles during editing. During editing Vegas keeps crashing and I have to close it via Task Manager. The sound keeps going but the video preview stops. Sometimes the external preview disappears by itself and I know that if I won't restart the program it's gonna freeze. This issue was there in Vegas since I use Vegas, since Vegas Pro 9, but this time Vegas 16 freezes even more often with multicamera editing.
I tried to disable GPU acceleration. Config: Ryzen 1700x, 16GB DDR4 memory, MSI 1080 Ti.
This problem happened on my old computer, too but less often with an i7-2600K, 8GB DDR3 memory and an AMD HD 7950 editing .mts files.