An important quest "return of the high chief" that leads up to the wrathgate event (horde) is not working for me. The purple crystal is shining but I cannot click on it.. The guy that should be inside the prison is also not there.. Have tried for a few days now.. still the same.. is anyone having the same trouble or is there any fix?

currently lvl 74 paladin (blood elf)

Thanks in advance :)