Passing image between multiple windows

I’m using the multi window example in of0.11. I’m trying to share an ofImage between the two separate ofApp instances. Whenever I try passing an ofImage, pixels, fbo, it doesn’t transmit the pixel data correctly? I always get a black rectangle the same size as the original image?
I’ve tried passing by reference, pointer, copy etc always with the same result?

Any ideas?

Here arturo gives answers to that: Sharing ofFbo between multiple windows: how? (shared_ptr?) [solved]