Don’t know if Pytheas will be giving any support or not.
The problem seems to be with the theme’s JQuery function that attempts to toggle a class in the css. The only alternative is to find a way to override this.
For the time being I’ve added a javascript file to my child theme, which does the same job that the JQuery function was supposed to do. It solves the problem to a great extend. I’m still fiddling with it and making things look acceptable. This is not the ideal solution, but I don’t think we’ll be getting an ideal solution.
Hope this helps.