@schumixmdI haven't done anything with OSD capabilities but TVout has been modified to do this previously (search the old thread linked to in the first post). An OSD has also been done with nothing more than a few resistors see (not TVout based but this is where I had planned on starting if I was to create a TVout OSD version): http://www.elenafrancesco.org/arduino/baroneosd/ which will do some basic text overlay.As far as the pollserial issues that is odd but not all that surprising as I did'nt do much testing beyond the super basic terminal app meant as a quick example on using the hbi_hook. If I remember correctly pollserial goes a bit crazy if the rx buffer gets full maybe start there? (make sure to handle the data fast enough maybe)
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