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After having been logged in for months on my Mac/Safari, twice within the last two days I've been greeted by the "Welcome to the Q&A for professional and enthusiast programmers" message and had to re-login. I never click the log out button, nor have I cleared my cookies. Have there been recent changes that might explain this? Will it continue?

Update: I remain logged on at work (Win7/IE8), despite having to re-login twice at home.

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same thing happened to me a day or two ago – Otaku Aug 2 '10 at 20:06
I've also had this issue the in the past 2 days – Nick Craver Aug 2 '10 at 21:40

No changes to login, no other reports of this problem.

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Except, apparently, from @Otaku and @Nick Craver as reported in comments to the question. – tvanfosson Aug 2 '10 at 21:58
Yeah. I was working as normal, clicked to go to another page and all of a sudden had the login screen show up. Another weird thing that happened was when I logged in, it said something like "Your account as been automatically associated with two other sites" and then upon following the link it showed me the association with SuperUser and Meta. I had already associated those before though. I just accepted it and moved on...but it was so bizarre I went outside and had a smoke. – Otaku Aug 2 '10 at 22:28
Heads up - I just got kicked out again, will try clearing cookies, but this is definitely a recent thing, whatever the cause is. – Nick Craver Aug 3 '10 at 11:40

Look at the cookie, it has an expiration date. I estimate it is one year starting from your last real login.

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I just checked and it appears to use a sliding expiration (as expected) as the times on the cookie after a later request have increased. Besides, I logged in yesterday and it happened again today. FWIW, it looks like the cookie window is 6 months, not 12. – tvanfosson Aug 2 '10 at 12:22
@tvanosson: you're right, the cookie is updated on every page reload. Maybe you should try deleting the cookie and then logging in again – Tobias Kienzler Aug 2 '10 at 12:31

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