For a day now, every time I go to MathOverflow, it says "This site is currently in read-only mode. We’ll return with full functionality soon." But I also see what appear to be new posts from other users, e.g., the new question, Conjecture about primes of a special form posted just a few minutes ago. What is going on here?

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    $\begingroup$ Could it be the same problem as meta.stackexchange.com/questions/399904/… ? $\endgroup$ Commented Jul 4 at 9:37
  • $\begingroup$ That helped – I was able to login using a different browser, so it's some kind of cache problem on the browser I usually use. But if I clear the cache, don't I lose all kinds of useful stuff? $\endgroup$ Commented Jul 4 at 10:46
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    $\begingroup$ In theory, you shouldn’t. Cache is supposed to store transient data that the browser needs repeatedly to improve speed, but such that it can be redownloaded any time. Clearing cookies can have more visible effects, such as logging you out. $\endgroup$ Commented Jul 4 at 11:37
  • $\begingroup$ Huh, it didn't say that for me. $\endgroup$
    – David Roberts Mod
    Commented Jul 4 at 20:55
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    $\begingroup$ @Emil, if you post an answer, I'll be happy to accept it. $\endgroup$ Commented Jul 4 at 22:07

1 Answer 1


There have been several reports in the past few months that something similar happened to random users on various SE sites, see Stack Overflow in Read Only mode for past 2 days.

A user suggests there as a workaround that clearing cache and cookies fixed the issue for them.


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