Same thing happened to me. I know for a fact I uploaded the tapestry from Dragon Age Keep, and then imported it when I made a new game.
I just met Hawke and he said that his brother was taken somewhere by Aveline, but to my knowledge it's only possible for Carver to be alive if you're a mage, which in my tapestry on DAK he was not. I have the actual physical save files on my hard drive, as well, so I don't really understand why the game failed to properly import data. Not that I mind too much, I guess. I had plans to replay the game, so hopefully by the time I'm on my second run through all these silly bugs have been fixed.
