How can I fix this? D:

EDIT: NOPE! It's still doing it. I want to use the b/w light bridge sign for a button, but it wont work, it keeps coming out as a shade of gray. Even after compiling it comes out that way

i also have a problem with looped sounds not looping, i unchecked that flag and it doesn't change a thing

Sounds will only play looped if they are designed to do so. The "is not looped" flag will only stop a loop-enabled sound from looping, it will not cause a one-shot sound to loop. (I remember reading somewhere that the .wav file needs to have some markers in it to ensure a seamless loop.)
I'm not sure if there's a way to recognise looping sounds in the sound browser, other than by their name which may have the word "loop" in it. You'll just have to try some different sounds and find one that works.

It's actually very random. Clearing the cache did make several textures appear again, but the light bridge refused to function. And NOW I am apparently dealing with an xray effect with the signs. I thought applying them like any normal brush was what i was supposed to do, I tried info_overlays, but that made the textures conflict with eachother