Can't Select Heroic Raid

No matter which raid I try to start, I select heroic 10 man? It goes to normal 10 man. Same with 25 Man. I simply can’t select 25 heroic or 10 man heroic raids.
I had a similiar issue that I reported a few weeks ago whereby I couldn’t complete heroic achievements because the raids simply kept resetting to normal when I walked through the gates. There were no “skull” symbols on the instance gate when I went in, which normally indicate heroic difficulty. This is very annoying.
Finally, I’m trying to complete this weekly raid achievement: “Disturbance Detected: Ulduar.” I follow the quest from quest giver inside, get to the end and no titan prison fragment drops. I took a screen shot for reference, but it’s not allowing me to post the picture. If you provide me with an email address, I’ll send a screen shot.

I’d like the achievement/credit for finishing quest.
Thanks