Cannot complete the checkout process!

A Turbo Tax expert completed my 2020 return. This afternoon during "Checkout", I was able to complete the "Filing Options", but I could go no further.  When I clicked on "Continue", I saw the spinner indicating Turbo Tax was doing something and then just a blank screen.  I'm stuck.  

 

This feels like a technical issue with Turbo Tax.  Can someone please help??