The teleport works but the shader isn't, I'm getting a yellow cirle as teleport

I don't know it's your shader code but I doubt it's my graphic card because it uses up to PS model 3.0 so... Just look at my sign. for more info about it

Btw, after I closed the demo, I got a new directory called "mtshader" on my hard drive

??
Cheers
Frazzle