As we mentioned earlier, today is the day that the first installment payment is due for 2010 Yankees season ticket invoices. Tens of thousands of Yankees fans are heading to their Yankees.com ticket account and many are facing the same problem - they can't add a new credit at checkout. When arriving at this screen, the add credit card button just doesn't do anything: This led to about an hour of frustration, trying different browsers, computers, etc. Of course, we should have just turned to our trusty Twitter account. Within minutes of sharing our frustration, the solution to our problem was right there in our "at replies." As it turns out, everyone is having issues adding a new credit card at checkout. Luckily, the workaround is simple. The first step is to navigate to the home screen...

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