When doing the level 45 Paladin Job quest, I jumped from the high ground where you get the gauntlets to the place where you get the Cuisses. After making it to the bottom, my character was unable to use abilities, teleport, log off, change jobs, or perform any action other than moving around.

After forceably shutting down the game and relogging, the same glitch happened after opening the chest and receiving the Cuisses.