This happened to me this morning. During the night someone apparently logged into my account from Mexico - I'm in Denmark. Sheer and utter panic here... changing passwords and usernames on several websites, as I save them in EN (nothing that could ruin my life, but simply cause a lot of hassle...).
Then I discovered the account activity log and the entry about login from Mexico is not on the list!
Very annoying! Seeing that this thread was started over a year ago, I reckon they didn't fix this problem. I'm contacting EN support about this now.