I don’t know if this is a bug or a desired effect, but since I updated with 1.05 patch, the quest items are stuck in my stash. I can’t move them neither to my inventory, nor rearrange them in the stash – they are just “glued” to their positions.

 

And before someone asks why I care about it – here is why. There is a quest item – a medallion that gives Might +2. If this is a true RPG I should be able to decide whether I want to return the item to the owner (some Elf who stole the medallion in the first place) or I decide to keep the medallion and use it instead (Might+2 is pretty good feat). Instead now I’m not able do anything with the quest items and the only option for me is to return the medallion to the elf. 

 

I play on Normal Difficulty and my stash is unrestricted.

When I completed that quest in 1.05, I had the option to keep the medallion (there was a dialogue option for it when talking to quest giver).