Can't Complete Quest: Headstone Pilgimage

Platform: Windows
ISP: Comcast
Type of Internet Connection: CATV
Internet Connection Speed: 15Mbps
Date & Time: May, 21th 2011 02:10:00 AM PST
Frequency: Continuous
Character Name: Bigboy
Race: TarutaruM
World: Quetzacoatl
Main Job: BLU, Lv. 90
Support Job: Ninja
Area and Coordinates: Behemoth's Dominion, G-9
Party or Solo: Party with 5 members
NPC Name: Cerment Headstone
Monster Name: Legendary Weapon and Ancient Weapon
Steps:

1. Talk to Cerment Headstone
2. select "Yes" (which should spawn 2 NM weapons)
3. Receive message: "Don't you have something better to do right now?"

All other headstones function correctly for this mission. I am stuck trying to get the fragment from the this headstone, and am unable to complete the mission until this issue has been resolved. As long as the NM's are unable to be spawned from the headstone, I am unable to proceed.

Greetings, Bigboy!
Thank you for taking the time to report this. This issue has been brought to our attention and has had a report submitted for investigation. I am very sorry for any inconvenience this has caused you.