Early problems as tickets for the London 2012 Olympics go on sale Tuesday . The Games will be held in London, England, from July 27 to August 5. London 2012 spokesman says the credit-card company is trying to improve system . Tuesday marks 500 days until the Olympics begin on July 25 , 2012 .
Early problems as tickets for the London 2012 Olympics go on sale Tuesday . Visa system prevents people with cards expiring in August from completing application . London 2012 spokesman says the credit-card company is trying to improve system . Tuesday marks 500 days until the Olympics begin on July 25 , 2012 .