Bukkit

What steps will reproduce the problem?
1. Have world autosave set to true
2. Build in the world spawn
3. Stop the server
4. start the server

What is the expected output? What do you see instead?
All of the stuff that was constructed in the spawn since the last forced save is gone if the server is stopped.  24 hours worth of stuff has been lost this time around.  Happened before on a previous version and lost a weeks worth.  Only in the spawn area tho.

What version of the product are you using?
R: v1.66 for 1.6.4 Oct 16, 2013

Do you have an error log of what happened?
no errors occured

Please provide any additional information below.
00:30:05 [INFO] Information about the world: Unknown
00:30:05 [INFO] Environment: normal
00:30:05 [INFO] Chunk generator: Default
00:30:05 [INFO] Auto-saving: true
00:30:05 [INFO] Keep spawn loaded: true
00:30:05 [INFO] World seed: 2731905389375817552
00:30:05 [INFO] World size: 64 Megabytes
00:30:05 [INFO] Nether portal: Unknown_nether
00:30:05 [INFO] Ender portal: Unknown_the_end
00:30:05 [INFO] PvP: Disabled
00:30:05 [INFO] Forced Respawn: No, allow bed spawns
00:30:05 [INFO] Remember last pos.: Yes, teleport to last known position
00:30:05 [INFO] Difficulty: easy
00:30:05 [INFO] Game mode: survival
00:30:05 [INFO] Time: 20:00 (8:00 pm)
00:30:05 [INFO] Weather: The sky is clear
00:30:05 [INFO] Status: Stand-by