I am having the same problem. Nothing shows up when opening Soundjack. I can see all my profile, etc, but nothing is showing on the stage. I am using a new FMB that I built and entering through the soundjack0.local site. My MBP can get to the stage just fine through the regular soundjack.eu URL. I have read the tech information.
I’m meeting with Christian on Sunday, but I didn’t know if anyone found the solution to this problem.