Hello there. (I'm submitting this reply because the other one wasn't submited for unknown reasons, or something...)
I've cleaned the valve folder from any mod leftovers and checked textures for conflicting issues. I've also cleared my mod's folder of any valve .wads or anything similar. However, none of these seem to be the cause of the problem.
While taking a quick look, I realized that I had accidentaly edited the HL game profile, and fixed it. It kinda solved solved the issue, although now when I run the map, it displays an error message (padev.wad not found, padev.wad is a .wad I'm using for dev textures and stuff).
I then thought that the problem had to do with the fact that I had replaced some developer textures, so I removed padev and replace it with halflife.wad, hoping it would ressolve the issue... which didn't solved the issue.
I then ran the map a second time, this time inside valve folder, and it also did nothing. The problem definitely has to do with compiling.