I'm just like Tim here, I probably would've cut the whole clutch already. I just get anxious to see what is in those little eggs!As far as the still-round egg, it likely just absorbed a little more water than the others, so never collapsed. Was it buried in the incubation medium more than the rest of the clutch?
Congrats by the way! You'll see thier little heads poking out of the eggs soon enough.
-Evan