I installed Visual Studio 2015 and opened a VS 2013 project, after which the old C # Windows Forms do not open.
I use F5, the debug menu appears but does not open anything on the screen, the project appears running in the task manager but nothing appears on the screen.
I created a new form and put it to start with it and it works, that is, the new forms I create open normal, the old ones do not open anymore.
No longer does VS 2013 run either.