I have had the double post problem now and then. I post something, it appears then disappears and almost by design, suddenly re-apears.
Yep Jack, now and then you write in invisible ink.
but that is ok. We Flutter-By owners can see it anyway.
The lights Jack uses are the Cat's Meow. I have lights on mine, not Jack's, but the way Jack installs them, is great. By all means, get lights. At dusk outside or indoors for night flying, another whole experience opens up for all of us Flutter-By owners with lights on.