Platform: PC
ISP: Movistar
Type of Internet Connection: ADSL
Internet Connection Speed: 10Mb/s
Date & Time: Oct. 18, 2011 00:01 GMT+2
Frequency: Once (did not reproduce)
Character Name: Umo Heima
Race: Highlander
World: Gysahl
Class/Level: Thaumaturge/50
Area and Coordinates: Gridania > Gridania Aetheryte Plaza (4, 4)
Party or Solo: Solo
NPC Name: Sybell
Monster Name: N/A
In-Game Time: 4:04
Steps:

1. Standing right in front of Camp Emerald Moss' aetheryte, I selected Teleport > The Black Shroud > Gridania via Main Menu.
2. I turned myself round and found NPC Sybell with her arms outstretched in an abnormal way (see screenshot for details)

I know it eventually happens on another NPCs across the realm aswell and I think it's been already reported, but I couldn't find related bug reports.