Solved.... I believe this is a bug in the software but here is the solution:
When Turbo Tax starts up it spins up 4-5 processes named "CefSharp.BrowserSubprocess". With TT running and the black screen showing, open Windows Task Manager and right click on these processes and select End Task. It may take a few attempts to close the correct one but when you do the black will go away and the activation screen will appear and you will be able to activate with your account.
As mentioned above, this sure seems like a bug. Why are so many of these processes spun up on startup, please take note and fix for future versions.
