I just went to High Hrothgar for the first time. I enter, and Master Arngeir asks me to shout. I do, and see all the special effects. But afterwards he keeps asking me to shout, like I didn't. Has anyone else had this problem? I know there are other postings concerning this quest, but it's not clear to me that it involves the same issue. Help?
Thanks,
Baolong

(in my defense, the special effects for the two are both blue).