Today update to the new version 5.6 to test the nds emulator.
What happens to me is that when you go to play, you start to show white stripes, and the game slows down.
I have tested on different cpu / gpu, intel hd520 and intel hd4000, and I get the same in both.
The truth is that it is the first time that I try an emulator of nds and I do not know if I am doing something wrong.
Since when I start to play no button on the controller works, until I do not pulse (L1), that's when I can use the buttons but the problems start ...