I have SOLVED the issues: Vulcan Crashing and/or game stop loading and or crash, for me it was a DEVICE LOST error.

After you have launched the game. In Task Manager (Alt+Ctrl+Del) These should be what you see and should be changing settings for:
    • BG3.exe
    • All sub-processes listed under BG3.exe
    • LariLauncher.exe
    • All sub-processes under LariLauncher--including all the CefSharp BrowserSubprocess's that are present. They will say something like this in the Command Line Tab:
        • C:\Program Files x86\Steam\…\…\Baldur's Gate 3\Launcher


In Task Manager-Processes- I went through the Processes listed above, Right clicked, and In their Properties I changed these things:
    • Under Compatibility- Enable Run as Admin
    • Under Settings for All Users I Enabled Admin for All Users



I think this one was the one that actually fixed the problem.

Go to Properties, Under Security tab I changed all Permissions to--Full--For all Groups and Users listed in this Box:

Then click Advanced button. With Inheritance enabled I added these Groups and Users: ALL with--Full--Permissions:
  • Everyone
  • Systems
  • Local Services
  • Users
  • My Account name
  • All Applications.
  • All Restricted Applications
  • Interactive