This morning, I had a comment on one of my hubs to moderate. I approved the comment, and then I clicked on the hub name to go answer it, but my hub would not come up on the screen, even though the correct URL appeared in the browser. I tried accessing the hub from my profile and from statistics, and the same thing happened.
I then tried reaching some of my other hubs, and it was all the same. They were inaccessible, though the URL was correct.