Glad that you found a workaround. Another one would be to have shorter layer names, if you can. I’m in the process of rewriting the WebApp, so I will not commit such a fix to the existing code. I will make a note to ensure that this does not become an issue in the new WebApp.
Unfortunately no. A lot has changed in the Rhino world as well as in Three.js (the webgl library Iris uses for rendering). We are evaluating the best way to move forward with this project.