My weapon disappeared also. Was at HM Garuda, hadn't logged on in about 2 months, only played here and there, then noticed when patch came out, my weapon is gone.

Spent about 170,000 gil getting items to make it and the tip for the person who made it for me.

Character: Peace Walker
World: Exodus
Job: Paladin

This happened I believe after 2.1 released, but to be on the same side, I would say from 2 months back from today.