Same problem, with Galacticraft installed I get this error:
2013-11-04 00:36:19 [INFO] [Minecraft-Server] Saving and pausing game...
2013-11-04 00:36:19 [INFO] [Minecraft-Server] Saving chunks for level 'New World'/Overworld
2013-11-04 00:36:19 [WARNING] [Minecraft-Server] The save is being...