Square-Enix is reporting a problem regarding the Miniature Aetheryte crystals:
We have confirmed an issue occurring since the maintenance which took place on Jun. 9, 2014 wherein players will become unable to use housing functions if private aetherytes are newly placed within the property (garden).
We are working on the issue and plan to have it addressed within the week. Until then, we ask that players please refrain from the placing of any private aetherytes on their property.
Please note, this issue will not affect those who placed private aetherytes on their property prior to the Jun. 9, 2014 maintenance.
We apologize for any inconvenience and thank you for your patience.
If this affects you, please consider teleporting to your FC’s home city and using the large Aetheryte crystal there to get home.
Original Notice: Confirmed Issue Regarding Housing Functions (Jun. 11)
Edit from Square-Enix:
*Edit: Jun. 13, 2014 3:23 a.m. (PDT)
The above issue was resolved as of the maintenance which occurred from Jun. 12, 2014 11:00 p.m to Jun. 13, 2014 1:25 a.m. (PDT).
We apologize for any inconvenience.