Hi Sebastian,
I don't know the answer directly, but I got a hunch.You are now loading 18 different tours in one page. That's a great number.
The main error is "Too many active WebGL contexts". Each browsers supports a different amount of contexts.
I would advise;
- To try out this implementation with a maximum of 8 iframes at the same time. And check if errors occur in the console.
- To create a Marzipano tour that has the 18 pictures in one tour or seperate the different tours over different HTML-pages.
Good luck and let us know how it worked out!
greetings
Joost