Thanks for the quick response! Here is a link to 3 shaders that aren't working for me: https://github.com/libretro/slang-shaders/tree/master/warp/shaders. I know most of the shaders in this repo are already in the RetroArch library but right now I'm just fiddling with the import tool to see if I can get it to work.
Is there any info I can provide you to help with the troubleshooting?