Just bought my 6th Hue bulb and am noticing the same thing…
If I go through the (+) button on the home screen, and attempt to add a Hue bulb, it never even seems to find my Hue Bridge…
If I go through the Hue Connect app (under SmartThings Labs), I see that my Hue Bridge is connected (with its IP) and it lists out my original 5 bulbs… This felt a bit more promising, but then it just keeps polling and polling for new bulbs without ever finding them.
Make any progress @juano2310?