Turn 254, all islands are mine, but I haven't been credited with a victory or with wiping out one of my opponents (was credited with doing away with the other one). One of the unreachable islands someone mentioned? Other bug? Dunno.
There definitely are glitches; there are four flotillae on the map right next to their destinations (or presumed destination in one, enemy, case) but not moving. The enemy flotilla that's frozen like that belongs to the enemy I did get credited with wiping out, so that's not what's behind that.