I spoke to them on Friday and they said “I’ll get back to you about the sidebar. Most of the time cleaning up the sidebar name fixed it for me. No spaces, special characters etc. But if I understood correctly it was already clean on the client install. I’ll check it out and let you know what I find.” I’ve tried that on your install, along with reinstalling a fresh version of the theme and such, still haven’t had a result. So now I’m wondering if it’s something server wise?? It seems to be ignoring the get sidebar command completely for custom sidebars, I’ve gone through the code and it all seems correct though.
I’ll get on to them tonight with follow up and see if they’ve found anything else.