What browser (and browser version) are you using? What operating system (and operating system version) are you using? Is your browser up-to-date?

Is there a way to trigger this, or does it appear to be random?

Do you have any custom CSS, and if so, could you try clearing it and see if you still have the issue? Are you able to try in a different browser and see if you still have the same issue?

I've pushed a fix. I'm not entirely sure how it was causing errors, but I noticed the page had some unnecessary redirects. I rewrote some parts to remove them so hopefully that solves it :)

I've confirmed this is fixed now, so I'll lock this up :) Thanks for the report!