Platform: Windows
ISP: Cox Communications
Type of Internet Connection: Ethernet
Internet Connection Speed: Unknown
Date & Time: May 11th 2013
Frequency: Twice, possibly more. Alliance members mentioned the same happening to them.
Character Name: Allslove
Race: Hume F
World: Ragnarok
Main Job: COR 99
Support Job: RNG
Area and Coordinates: Ceizak Battlegrounds / Cirdas [U]
Party or Solo: Alliance 18 members
NPC Name: None
Monster Name: none
Steps:

1) Enter Fracture
2) Try to leave

What is happening:

The animation for being teleported from the area plays, but then you get stuck with a black screen while the music continues to play. The ability to type, check inventory, browse menus remain. Chat is disabled. I actually managed to successfully submit a GM report on the first occurrence. In order for it to resolve itself, you either need to wait for or force a disconnect.

Additionally, disconnecting in the Fracture produces similar effects.