Maintenance for the week of May 18:
• NA megaservers for maintenance – May 18, 4:00AM EDT (8:00 UTC) - 9:00AM EDT (13:00 UTC)
• EU megaservers for maintenance – May 18, 8:00 UTC (4:00AM EDT) - 13:00 UTC (9:00AM EDT)
It's being discussed in the BUG REPORT section on the forums. There is a thread titled "Quest not working" (or something very close to that). In that thread is a number of things to check, and I was able to fix the problem I was having. Two of my files were changed to "0" when they should of been "-1".