Just a FYI, yep its been happening a lot on this thread, I put it down to things being deleted. So on my firefox I get a lot where it either doesn't go to the next page or jumps back one. For example I can't get page 480 and 481 but am back at page 482.
So changed page number manually and paste to the end "?v=nocache" and got the correct page.
Tried loading ephiphany web browser no problem, logged in and not logged in. No problem
Also tried my Android tablet and no problem on that either.