iirc, you can only use cracked red eye orbs in locations that aren't blocked. if you notice, you can't place down red soap stone, white soap stone, dragon eye stone, etc., in certain areas. such as, you can't place a dragon eye stone down in firelink or near the bonfire by the blacksmith, but if you walk out, its activated fine again.
"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former." - Albert Einstein LoL IGN: nvmvoidrays