On windows 10, if AppGameKit studio launches minimised clicking on the icon in the taskbar does not restore it back to full screen (or window). Instead it appears to attempt to do this and then re-minimise again.
This "state" occurs if you minimise AppGameKit then close it from the taskbar.
If this happens to you Launch it then press SHIFT and Right click on the icon (in the task bar) ; then select Maximise; this will restore the window so you can edit your code again..
I guess this is an annoying "feature"/"bug" of the IDE .. (you choose).. Other apps appear to just work by clicking on their icons in the task bar.