Platform: Windows 7
ISP: Time Warner
Type of Internet Connection: Cable
Internet Connection Speed: ~2MBps
Date & Time: 10:30AM PST
Frequency: Once
Character Name: Tetsujin
Race: Hume M
World: Cerberus
Main Job: SCH99
Support Job: RDM49
Area and Coordinates: Nyzul Isle Uncharted Area -- N/A
Party or Solo: Party, 6/6
NPC Name: None
Monster Name: Lord Vryko

Steps:
1. Entered Nyzul Isle Uncharted, made it to floor 80. Defeated Lord Vryko.
2. "euxine kecks +3" drop into the treasure pool. Lot on the item.
3. Error message:
"You could not obtain euxine kecks +3. Either your inventory is full or you can only hold one item of that type."

-- My inventory was not full (I specifically checked) and I have no such item anywhere on my account. This was the fourth run and I'd been out-lotted the other times the item dropped, so I was a bit upset.