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It seems like you may have shot the sun with sunhallowed arrows instead of the bloodcursed arrows. Because that's what the sun does when you shoot a sunhallowed arrow at the sun from auriel's bow.
I have the same issue. I've been searching for a fix, or even mention of this bug from another player since the day after dawnguard released on PC. I was able to get the power to work about three times, then eventually it just stopped working. I couldn't use bloodcursed or sunhallowed arrows to...