Been waiting a couple days for a server check to hunt Jr. Balrogs for the key to unlock Berserk. Used summoning sacks to get the drop - used about 8 and 400m+ later and no key drop. Zero sacks left in the server. If there was a set schedule for server checks this wouldn't be as bad but seeing as they seem to be semi-random this has become a problem.
Well, in my paladin I have similar quest (in my case is for Heaven's hammer). I though it was a glitch too, but in my second black sack it dropped 2 keys XD