I haven't a clue where to go now. I just uncovered the part where a raven was under cover in the caves. I have NO QUESTS for Grizzleheim but I KNOW there are more to do, especially since I haven't gone into Wintertusk yet (got stuck here last time and don't remember how I got UNstuck).
Also, there's another problem/bug. If I talk to Erik Wyrdrune, he has a greyed out question mark, meaning I have yet to complete a quest (the one about the runes), but it's NOT listed in my quest log (same thing happened last time too).