About working with Wizards of the Coast…

It’s apparently difficult to deal with them as we saw with different companies that worked with theirs licences (like Larian). And we've be shown again recently that WotC are problematic when it comes to things related to commercial rights...

But other than that, what kind of problems did Larian meet for the collab to be horrible to the point that they dont want to make another game with them?

I'm asking because we hear a lot that the team was given free rein, so I assume this isn’t related to the making of the game per se...? Was it financial issues? The distribution of shares of the rights (author and commercial)?