Whit the Lock summoning stone? Had the same problem clicked accept and then nothing and had to summon every one 2 or 3 times till it took. Luckaly the stone costs 1 shard and lasts 5 minuts other wise the locks would have ran out
As a mutilate dagger rogue, I did the most AoE damage out of all the mages/boomkins/pallies etc. in the 10man naxx raid , sitting on something silly like 7000dps for it - and I dont even have killing spree.
I did an heroic and tried my summoning spell (looks cool btw ) but it did not work then when I was raiding I tried again and it worked... weird ;confused;