Hi, same install I've been working with since the phpbb conversion.
Yes, it happened right after I enabled the cookie. That's why I immediately thought it might have something to do with the cookie being set but even after disabling it, it kept going on.
After all this time, it is still happening today.
Another change I think I've noticed is that I'm no longer getting automatically logged in. I've had the admin user logged in for days and it's never been auto logged out. However, as soon as I log out, then I have to close the tab, restart the browser and clear the history before I can log in again.
Using Tor, I can simply close Tor, restart it and can get in again since nothing is saved. I've been testing this on Chrome, Firefox and Tor.
Update: I just tried the following.
-Opened window to forums using firewall, Get popup.
-Closed browser, re-opened, cleared last hour history. Opened new tab to forums. Get popup.
-Cleared one hour history then closed tab and closed browser. Re-started browser, opened new tab. Get popup.
-Closed tab, cleared ALL history in FF. Opened new tab to forums. Now it works, I can log in but clearing all history is not a good option as now I'm logged out of dozens of tabs I have open working on other things.
Went back to Chrome. Found admin auto logged out after all. Logged back in no problem. Logged out and got the popup, could not log in again.
Cleared last hour of history without restarting Chrome and was able to log in again.