I have found that one of my audio plugins is stopping Vegas Pro 18 from starting. Is there an error log I can find that shows what loads into VP18 so I can find the culprit? I found this to be an audio plugin problem because when I rename my vst folders vegas starts just fine. ; )
There is a log file that shows which VST plugins are loaded. Copy and paste this folder path into a Windows Explorer address bar: %LOCALAPPDATA%\VEGAS Pro\18.0
Then look for the file vst_grovel.log
If you know which folder contains the plugin that is causing a problem, try removing plugins until you find which one is causing the problem. You can do this the slow way (one at a time), or using a faster binary search (removing/replacing half each time). There may of course be more than one plugin causing a problem.