I can't seem to log in with my Stack Exchange OpenID. When I try, I get the error message:
Unable to log in with your OpenID provider:
The openid.return_to parameter (https://unix.stackexchange.com/users/authenticate/?s=......) does not match the actual URL (https://unix.stackexchange.com/users/authenticate/?s=......) the request was made with.
It works if I disable the HTTPS-Everywhere plugin in Firefox, but if I then re-enable the plugin and go to a site on which I am not logged in (in which case login is normally nearly seamless), it fails again with the same error message, or at least something very similar.
I'm not aware of having done anything that might have caused this, although I will admit I don't recall seeing
https:// in the address bar on Stack Exchange before (I do now, and that's a good thing IMO!). I was using the site a few hours ago and it worked fine then, but not now...