Hi there,
I allready wrote a Ticket because of that, and the answer wasn´t what I expected, but maybe it´s helpful to other players!
I started the Warlock Epicmountquest on Elysium Horde this afternoon, killing the Owls in Winterspring, heading back and started the Questchain for the Goblin, unfortunatly I reseved the quest for Jadenar at the same time, or was able to accept it. So I bought the stuff you need, dragonscales etc. and headed to Felwood, to get the Stardust, after that i returned to the Burning Steppes to deliver the Stuff!
Now is the point where it´s starts to be buggy, I thing, normally, the quest for Jadenar apears after the matsquests for the goblin!
As I tryed to deliver all the stuff to the goblin, I can´t deliver the dragonscales, and the quest disapeared in my questlog, so i can´t cancel it to start it again.
The Goblin got the golden questionmark, but I was unable to complete the quest, like i didn´t have the qitem!
But i was able to complete the Jadenar quest, in witch you have to buy Xorothian Stardust for 150g.
So everything´s fine I thought, but I didnt reseved´the Imp for the following quest in Scholomance, and the questline broke at this point!
So be sure everything is working correctly and take a look at different databases on the web to check if your at the right step of the questline, because as the friendly GM told me after 4 hours, you won´t get back any of the items or g that are lost in this bug!
After deleting the WTF and WTB folder in my WoW folder, as he told me, the Quest apears in my questlog again, I wasn´t able to complete it, but at last I could cancel it and start it again, which worked so far as i could deliver the dragonscales, and at the end got the Imp in following of delivering the arcanit bars, without have to go to jandenar again an pay the money!
So at the end, it worked as GM entended, but was a lot of pain in my ass ;)