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Thanks for your reply. 

The issue fixed itself after restarting PC several a couple of times. I think it was, in fact, something related to GPU  or the Nvidia Card. It has only happened with FPS Editor so far.  

Also I updated the drivers, so maybe that was the issue.

I tried with CE and older versions.

Regards.

Has anybody seen this error? This is when testing the game. I have Windows 11.

Sure. Let's say I want to do a Dither effect like in the last screenshot. In which event should I enter the code? Should all lines go into the draw_gui event? Thanks for your help.

Sorry, I'm kinda new to Gamemaker. Can you please explain further how to use these shader? Maybe give an example. Thanks