At the recent to-be-improved SCKLM, I wore Adidas Supernova Glide. My calfs and a very seldom heard muscle set (it was either Adductor Longus or Gracilis muscle) cramped! Even, there was a mild contraction at my face muscle, around my jaw area (buccinator I guess). Funny...
My running posture got to be a constant. So, it's down to my shoes. Perhaps, how both shoes absorb and distribute the impact to our legs are very different.