Hi Erika, thank you so much for your prompt answer!
I’m don’t know super much about WP… How do you see a javascript error?
I googled a bit to find out how to ” determine whether a plugin or (my) active theme (are interfering)”… Should I just try with the basic WP theme, and also try deleting other plugins?
Sorry I can’t be of more help… I just lack the knowledge on how to fix this. If you feel that you can fix it and are up for it, I could perhaps send you some money through Paypal in exchange for fixing it?