been getting session verification failures....

[precrime3]

Its been happening more and more frequently. Its not that inconvenient to log in and out, but what is causing it?

[theymos]

I very rarely see that error. Maybe your browser is handling cookies strangely or aggressively caching pages.

[precrime3]

I very rarely see that error. Maybe your browser is handling cookies strangely or aggressively caching pages.

On my mobile, wp8 Lumia 810 to be exact. It happens every now and then, and it just happened, and when I tried to log out, it kept saying verification failed... Finally got to work though.

[theymos]

You'll notice that some links (such as the logout link) end in a long code like this:
https://bitcointalk.org/index.php?action=logout;sesc=3da541559918a808c2402bba5012f6c
All forms also have something like this, but it's hidden. The purpose of this code is to prevent CSRF attacks.

If you click a link or send a form that contains the wrong code, then you get the "session verification failed" error. This can happen when your code changes, but you're still looking at the old version of the page for some reason. Aggressive caching could cause this. Or maybe your browser is discarding the PHPSESSID cookie very frequently for some reason; your session code changes whenever you're issued a new PHPSESSID.