John2024,
i have the identical problem with Windows 10. I have tried all of the support teams suggestions but still get the black activation screen. I have uninstalled and re-installed TurboTax. I have changed display settings. I have disabled my firewall. I have added TurboTax and CelfSharp.browser.subprocces.exe as safe programs in Windows Defender. I have run TT in Windows 8 compatibility mode. I have downloaded the latest version of Microsoft Visual C++. I have turned off my second monitor. None of these changes solved my black Activation Screen problem.
John, did you find a solution to the problem?
