Hello, I have had this issue for months now and support has been entirely unhelpful. I do not know what caused this, but after years of use my my vegas pro 15 (build 416) video preview window is entirely black even when I change the default preview background. When I render anything out of vegas the resulting video is also completely black. The audio seems unaffected. I have tried all kinds of troubleshooting steps including multiple clean uninstalls and reinstalls. Is there anything I can do to fix this? Thanks