Twice now In the past 10 days I've seen very unusual occurrences which lead me to believe you have a serious issue on the back end with sessions being crossed and users logon & account data being sent to the wrong people. I logged in this morning and it took me to a portugese page and had me logged in as another user where I could see their information and change their settings. And the other day I noticed after logging in that it wasn't actually me, that time I just signed out.
This reminds me of the AT&T site issue where due to incorrect server configurations that peoples sessions were occasionally getting crossed or duplicated when logging in at the same time causing users to be authenticated for other users accounts.
Not that I have important information here, but I really do think you need to check your authentication servers before this becomes a big issue.