Hmm.
Perhaps a modification "secretly" changed or removed them without your knowledge?
some mods do "secretly" remove little bits of code for it to work
So I'm new, but not nooby...so here are pictures of my modded chiliad (made with MEd v0.32)
THESE SCREEN SHOTS WERE TAKEN IN MEd (the modded map is for basejumping =P
thats it