@otakuloser, reset settings from MISC me nu, you won't have license check message after.
about Screen size, you need to go to Video menu, choose special screen size, go back just one time and then enter into MISC menu and choose 4/3 mode.
Shaders has nothing to do with Psx Screen size.. they all works wth any screen size.
@idiotekque, shaders like HD4X and FXAA enhance GFX highly, they interpolate smartly pixels to the resolution of your device. If your device has low resolution, you shouldn't see much difference but if you have at least a 720p screen, there is much differences.
Run a game in soft mode and unset Filtering, quit the game, now from COver menu, go to MISC menu and Shaders then put Normal Scaler, run the Game , and see. Now quit the game, and from shader menu put FXAA. start the game and compare. you still see nothing?
About OpenGL you say you see nothing??? emulation is much better, GFX are much sharper, on any device.