When I paid for Audit Defense, the browser window was too large for my standard 1920x1080 laptop screen, so that the [Back] and [Continue] buttons were off-screen. I had to guess that the blue sliver was [Continue].
When I attempted to pay for state e-file, the browser window was now completely blank. I tried several times.
The likely problem is TurboTax for Windows does not handle scaled screen resolution, which is common and even recommended in Windows 10. I right-clicked on my desktop, chose Display settings, then under "Scale and Layout" I changed "Change the size of text, apps and other items" from 150% (Recommended) to 125%. I quit and restart TurboTax for Windows and the blank window problem was gone and the window wasn't too large. It seems Intuit's programmers don't deal properly with scaling in Windows. Note that this fix is not in the random laundry list of things to try in that "Troubleshoot blank screens, missing buttons, or missing images " link. It should be the first thing in the list to try.
