Maximizing Graal Window

[r_u_f_u_s]

Just a few things I noticed, I don't know if they are major errors, just some things go wrong

I can only see the lighting effects when the graal window is maximized, and also when it isn't maximizing it goes very laggy until I make the window bigger, then it goes super fast. Another thing, when I do maximize the window and I switch to another program running, the screen goes black and I have to restart graal (see pic below)