[jitter] Andrew's cruel joke

So, upon seeing jit.gl.cubemap referenced by Andrew as something tantalizingly confusing, I immediately created a new patch in Max 5.0 and created a new object box and typed it in.
Crash.
Followed by trying the same thing but creating a render object and initiating jit.gl.cubemap with a named context.  Still crashed.
Anything I should know about this mysterious object?  I feel like I just tried to open the Hellraiser Cube.