I don't know how to reproduce the error but CircutStudio from time to time just doesn't show the 2D PCB editing window and I need to restart the application. The problem is once I restart it, I am able to see the directX scene until I drop the mouse pointer inside of the window to try to zoom, move the scene or anything. Once this happens I am stuck and I can't use CS. I've managed to get it to work by reinstalling the application but I'd like to know if there is a way to fix this without reinstalling it.