Time: since 3.1
Frequency: since 3.1
World name: Behemoth
Character name: Azurrei
NPC name: Chocobo Stables
Monster name: N/A
Class/Level: BLM /60
Party or solo: solo
In-game time: 2pm 11/12 (when screenshots were taken)
Area and coordinates: The Mist / The Lavender Beds, Private Estates
Steps:

1) All guest have access to stable/train chocobos
2) As an Owner, able to train my own chocobo but not any other guest chocobo
3) As a guest, able to train owners AND quest chocobos

Screenshots:

http://imgur.com/a/aObXd