So, I'm not sure if I'm right on this or not, so I figured I'd ask around on here before submitting a bug report. I've been playing around with the spell adjustments, and have come to Enlarge Person. I noticed that melee weapons do seem to be modified properly (moving up a damage die). Ranged weapons, properly, are not modified. However, I've noticed the Unarmed Strike 'weapon' is not modified (staying at 1d3 for my normally medium character). I believe this should move to 1d4 when that medium creature is enlarged to large, but am not certain on that.