Question about fullscreen in ofx and screencapture

I am building an installation that requires an ofx application running, and a background application that is doing an screencapture of the ofx app. All works like a charm until the application uses ofToggleFullscreen or is launched as a OF_FULLSCREEN window, that the capture freezes the frame, unless there is another window over the ofx window.

I have seen this happening after the migration to GLFW, in several applications, when I remotely connect (for example with logmein). I have seen this only in windows, I haven’t tried in any other platform.

Any ideas on how to avoid this behavior or what causes it?