Can't delete a multireddit or remove subreddits from a multireddit

Right now I would like to delete a multireddit, but clicking "yes" to confirm it at the right side bar only happens to briefly show a "loading" icon, and then nothing happens. Also, I can add a subreddit to a multireddit, but if I try to remove one by clicking the "x" next to it and then reload the page, it is still there.

I'm using Chrome, Windows 10 Home x64.