I think you should choose a more descriptive title (possibly Vegas Pro 18 - black screen) and mark the thread as "resolved". There are some threads where users complain about a black screen. Maybe it's a help to those. 👍
@wiel-gulpen ... Sonic also mentioned as a problem by set with corrupted displays in Vegas Pro - mainly related to Realtek drivers - in a recent comment:
set wrote on 9/20/2020, 8:29 PM
Besides of Realtek HD audio driver, I got this issue on Sonic application ("Sonic Radar 3" and "Sonic Studio 3") on my ASUS ROG. After uninstalling it, problems gone.