I'm stumbled in the famous Return to Grace quest bug. I've talked with Svari, then Greta, so I went in the catacombs. After, I've brought the Amulet of Talos to Greta. So I had the "complete quest" message and now isn't anymore active, but I still have the Amulet and Greta hasn't given to me any reward. I've experienced this "missing reward" bug also with some other minor quests. It's very rare, but it's happened also with 1-2 minor quests (I don't remember what quests).

Another bug concern the favorites menu. It seems to happen especially when you have 2 or more of that item. Now I explain it:
As you know, you can call the favorites menu pressing Q, and so assign a number key for a quick equip of that item.
I use the 1 for bow and 2 for sword. But when I'v taken another Dwarven Bow (my bow assigned to 1), problems begins. Every time I pass to 2 for sword, then the 1 was no longer assigned to the bow. So every time I need the bow, I was forced to go in item menu and select it. I've tried to re-assign 1 to the bow many times, but ALWAYS when I press 2 for the sword, then the bow is no longer assigned to 1. I repeat that the problem SEEMS to be related to have 2 or more of that item (Dwarven Bow in this case). Seems.