Just something I ran into recently, figured I would post it for those who don't want to search hard for an answer, if they run into it. VS wanted me to sign in to re-validate that infamous 90 day free trial license, wouldn't let me click on anything else, when I started VS up, but the sign in screen was blank. Hadn't encountered this before after all these years, took me awhile to find a solution.
Control Panel > Internet Options > Security
Simply lower the security for internet/local zones. (you can change it back after). An article mentioned to just reset them to default, but mine were already on default settings.
Visual Studio Blank Sign in screen
Linear Mode
