You were right to change it to LINEAR (WRAP is wrong for the filters). You said in a previous post you copied the effect to different locations to try getting it to work. Are you sure you changed the right copy?
g_pTestShader is a NULL pointer, or Cam is a NULL reference.
Yeah, g_pTestShader is a NULL pointer.
I think the problem is my file directory ("TestShader.fx"), but I have the shader file in my root directory and in the cpp files location (just in case). But it still doesn't seem to load the file correctly