What version of soartex do you have? 2.2? 2.3? 2.4? Version number can be found in the texture pack menu.My texture pack isn't working. I have missing texture or corrupted texture all over the place no matter optifine is installed or not. i have some **GL error** 1282 or something like that in my log.
Have you used the mod patcher?
What version of Minecraft are you on and what mods do you have installed?
I fixed a spammy GL error in Soartex 2.2.x a while back.