ok what happens is, ill summon someone. but say they are going 2 get stuck, it doesn't actually inform you of this till they actually are summoned 2 your location. so you basically summon them, wait, see them pop up on you, then UBER quick disapear and get a msg stating you can't summon where they would get stuck. and then you have 2 wait all over again for ultimate cool down.

quite often ill stand in a corner (not jumping) with about 2 feet of clearance above my head (roof) and it will claim that I can't summon them cause they will be stuck.. it's weird.