ofxFlowTools: optical flow, fluid dynamics and particles in GLSL

This is incredible! Nicely done.

I'm trying to put together something for a party and would love to use some of this functionality. One problem I'm running into is that when I attempt to implement Syphon it doesn't work! If I try to publishScreen it just spits out a black syphon feed. With Syphon it recommends setting up the window like this

//ofAppGlutWindow window;
//ofSetupOpenGL(&window, 1280, 720, OF_WINDOW);

But when I try that, then the application window goes black, too. Any thoughts? I can't seem to figure out where the drawing is stored. If it's in a texture somewhere, I could use publishTexture, perhaps.

Thanks!