Not being a smart ass, just checking. Because my more than one of my guildies had this problem too. Have you double checked that you didn't get a quest? Opening your journal and checking? Most of the PB quests are pop up auto quests and I've seen many people have had problems not having the quest pop up on screen but they are auto accepted and there in the journal when they look.
If its not there you may still be ok. Go back to SW or OGM to the main trainer and see if they give you a quest for the final EK trainer. You've missed out only on a quest that sends you back to the main city trainer so its not a huge deal.
If the trainer wont give you the final quest then it sounds like its glitched and you'll prolly have to open a ticket to get that last quest.