I had the problem way before any of the Klingon PvE missions were added. If you never did the original Nebula missions from what's-her-face, you have the problem. But getting "Welcoming the Federation" fixes it.
Curious. Had you recently completed the Klingon batleth tournament?
I can't complete it because I don't get the accolade. I have tried 7 times, i think. Maybe 8 and don't get it.
I have tried EVERYTHING with the Destiny quest and can't get outside the doors in Qu'onos. The problem is a flag problem with the Welcoming the Federation quest.
I have 2 tickets and a month old thread on the Gameplay bug forums.
It is an easy fix for you guys (share the welcoming the federation with me), but impossible for me.
oh, and I have two klingon toons, one a Liberated Borg Klingon that I created the day those came out. Don't have the problem with any quest.
The other, a joined trill (again, created the day it came out), that has alot of problems finishing quests.