fire help?!

ive got this problem, whenever i try to set something on fire via ANY MEANS it catches fire , and theres smoke, it hurts, but theres no actual fire, like the decal is missing or something.i dont know why, its just smoke rising off whatevers burning.anyone know why this could be happening? can someoen send me a file if its the matter of something missing?
thanx in advance!

Try doing this.

Create Custom Server
sv_cheats 1
ent_create env_fire
ent_fire env_fire addoutput “firesize 50”
ent_fire env_fire startfire

again, wrong section

ok, im sorry im new what section do i put it in?