Hey InOD-Ron, I just got done dealing with support chat and I may have a solution. After you log in and get the blank page, replace the word "homepage" in the address bar with "?useAppfabricSPA=false" (without the double quotes). Once I did that, it displayed and allowed me to use QBO in IE 11 and I was able to export my data.
Original URL: https://c71.qbo.intuit.com/app/homepage
Working URL: https://c71.qbo.intuit.com/app/?useAppfabricSPA=false
