That unfortunately did not work. After 15 minutes of wrestling I was able to simultaneously scroll up and quickly click in the region of the button and it finally went. I had to reposition the dock in order to even attempt this and it took many, many tries and swearing before I was successful. This is an amazing bug in TurboTax. The 'browser' payment window that comes up is only resizeable in an horizontal fashion. If I were able to resize it vertically perhaps it would have allowed a normal scroll to get to the button.
