Sorry for the trouble!
Getting no feedback by vvvv about the actual problem isn’t so lovely. The latest gamma 5.0 preview build should be able to tell you more about what the actual problem is. I hope that helps!
My guess: It’s probably related to command-line arguments.
Please tell us if the new version was able to help you here.
i cleaned every trace of vvvv from my pc and reinstalled the latest preview, the issue is gone. we will never know what went wrong. the windows event viewer wasn’t helpful, no entry.