I am wondering whether @gopher.ny 's comments on the original eventstream / websocket conversation may be relevant. He spoke about making changes late last year. Did these platform changes get applied @gopher.ny ?
EDIT: Actually, that seems to be a different problem, multi-line vs long text....
I am also using the Advanced Hue integration by @armand. I don't see the same error come up there, could there be a difference in the way the two (Advanced Hue and CocoHue) are handling the eventstream data?