I just have same problem, but only happen if I try to run editor from exe… If I run it from Visual i dont have any problems… You should run \Engine\Build\BatchFiles\RegisterShellCommands.bat as an admin.
Now go to your project folder and right-click on your “.uproject” file and click “Generate Visual projects”, it will create a .sln that is set up to use editor under your source code directory instead of installed one. Now, open up .sln for your project and Build it with Development Editor/Win64 configuration and Press F5.