Upfront Editor Not Loading (or ridiculously slow)

Hello,

I am trying to use the Upfront editor but it simply won’t load. I was using it successfully (even after your most recent update) and upfront – for a reason that I cannot figure out – has decided that it will not load (or take a ridiculously long time to load… I haven’t managed to out-wait it yet!).

Please let me know how to resolve this. I’ve opened my site to support access.

Thanks,

Ryan