crash with jit.gl.shader help file

in the jit.gl.shader helpfile,
selecting either of the first two shaders in the "vertdisplace" category crashes max immediately everytime, whereas the third gives this error:

• error: jit.gl.shader: CG framework failed to load -- unable to use CG shader programs!
• error: jit.gl.shader: unable to load program!
• error: jit.gl.shader: unable to find usable language implementation.
• error: jit.gl.shader: error loading shader!