It seems like every since I downloaded the dragon born expansion, my elder scroll no longer works. I have leveled my character to 44 just doing all of the side quests, not focusing on what i realized was the main quest line. After completing the majority of side quests, about 135 hours worth, I delved back into the main story. My next quest was to summit the Throat of the World and meet Parthurnaxx(or however you spell it). I meet him, he explains in need an Elder Scroll to continue.. Little does he know I already have it

I have tried reloading previous saves, still didn't work. Fast travelling about, doing more quests and coming back to it again with no avail. I've done about all I can do on my end.
This is a bummer, I have spent A LOT of hours in what was probably one of the best games I have ever played. If I am not able to continue the story line or have to 'start over' I will be severely disappointed