Hi. Youve hooked up the outlet of jit.gl.node to the videoplane. Thats incorrect. It looks like you want to hook the second outlet of the jit.gl.node to the jit.gl.mesh, so that the MESH draws to the internal texture.
So it goes.
* node captures mesh to a texture.
* node outputs texture to video plane to see it in the jitter app.
* node outputs texture to syphon, so syphon sees it.
That one fix, seems to solve it for me.