Codeforces has a big bug. First, make a virtual paticipation of any contest. Second, in your Contests page, change its time to bilions of years later. You may repeat it some times. After doing this, you will see a big bug and then your Contests page is never available. I did this stupid thing some months ago, and my Contests page has never been available for months. I wonder if someone can help me deleting that VP contest and make my Contests page return.