[3.0.3/3.0.4] Friends unable to load chunks on my server two days after making it.

[Kelethius]

Title: Friends unable to load chunks on my server two days after making it.

Version: 3.0.3/3.0.4

OS: Windows 7 Professional, Service Pack 1 64-bit operating system

Java Version: Java 7 update 4 (64-bit)

Description of Problem:

The issue I am having is that I made a server a couple of days ago, two friends of mine have been on and off with no issues. Out of the blue they are unable to load chunks when they log in, but able to the sky box and void as well as mobs far off in the distance. I am using hamachi, and I remade a new server and he joined and loaded with out any issues.

PS. Everything loads just fine for me when I join.

Error Messages:

N/A

Error Log:

http://pastebin.com/3pcnKecs