I found several dragon walls or whatever and learned the shouts, but needed dragon souls to unlock them, right? So I killed one dragon from the main quest line and unlocked the push-back shout.
But now I just killed a random dragon that attacked me, absorbed it's soul, but none of the other shouts that I had got unlocked? How do I unlock them?

Two other threads on this question, on the same page.

http://www.gamesas.com/index.php?/topic/1271288-unable-to-apply-dragon-souls/

http://www.gamesas.com/index.php?/topic/1271303-dragon-souls-what-the-derp/