Well, I did a search and couldn't find anything specifically relating to this.
Basically, the Den of Flame is amazing, it appears to still have Elite Drop Rates for leather. By this I mean, nine times out of ten you get x2 heavy leather or x2 thick leather, it is awesome and a great money earner :3
Also, I wasn't sure where to post this in guides or exploits, but I posted it here seeing as I'm guessing this will be fixxed soon.