Last night I was testing with VP18, all went well! I decided to install Sony Catalyst Browse 2019.2 (When al software was closed) and when I tried to open Catalyst, it crashed after the splash logo. I deinstalled it and went on with VP18, but now on this point VP18 also started crashing during splash logo. So my installation/deinstall of Catalyst triggered crashing behavior on VP18.
Even after a few deinstall/reinstall attempt of VP18 it kept crashing on startup.
So my resolve was to go back to a Windows Restore Point of earlier this week. Then I installed VEGAS Pro 18 again, and now it works.
I'm affraid of installing Sony Catalyst Browse again on any Vegas based system in the future.
I did sent the error-reports to the Vegas team, hope there will be an explaination for this.