Nostalrius Begins - Quality wow vanilla realm (1.12)

I can't complete The Thandol Span quest. I already tried disabling addons, deleting WDB, WTF etc etc.
The thing is other people can complete the quest. Is it a problem with my client? I got the game downloaded from feenix site when emerald dream launched. I wonder what it is. Thanks in advance.

Have you tried abandoning the quest and re-obtaining it?

Heh, i did abandon the quest but that didn't work. I also relogged and reopened WoW client.
I even installed the nostalrius client to try this quest on this one. Still nothing happens. Any other ideas ?

// edit : after today's relog on nost client(not feenix one), surprisingly it worked. Thanks anyway! Problem solved.