Blocks I Place That Im Near Disapear

[xEvilCookieMonsterx]

Title: Blocks I Place That Im Near Disapear

Version: 3.0.3/3.0.4

OS: Windows 7

Java Version: Java V7

Description of Problem:

Okay when I first started my server everything was fine then when I save all and stop then start it again when i want to the blocks i placed that are near me just disapear and then I fix it then same thing happens again

Error Messages:

Error Log:

[Toasteh]

I can't make my own thread yet so I'm just going to post here. At least you get a bump.

[Torezu]

Are you near the spawn and don't have OP?