When I tried to use SuperUser.com (the main site) just now, I realized that I'm not logged in. So, I tried to login, but the password recovery option reports errors that my eMail addresses aren't recognized (sometimes in the form of "The page could not be found" which I believe is not the same as a 404 Not found error since the page definitely is valid as the URI hasn't changed) and sends me to the "Stack Exchange OpenID" page (where trying again also fails with "invalid eMail address" errors -- my eMail address is definitely valid; it used to work on this system, and it works just fine on a daily basis with the legitimate eMails I receive along with the hundreds of spam I constantly get in my junk folder).
I signed up under the "Stack Exchange OpenID" system a long time ago (many months at least, and near the time it just got promoted from beta if I recall correctly), and it seems to have been working just fine until today. (Note that this is not the same as the regular OpenID.org system, which I gave up on since it never worked because they only support a subset of valid RFC-compliant standard eMail addresses, and they did not respond to any of my requests for help with their system.)
Stack Exchange's OpenID system
I'm worried that my account may have been deleted (accidentally?), but I'm also not sure that this is the case because I can still use other sites, including this meta site, without any problems. I hope this is merely an easily fixable side-effect of the recent account merger problems (https://meta.superuser.com/questions/3661/problems-with-account-mergers-again-and-i-didnt-request-a-merger-this-tim).
Thanks in advance.