tekkit items and blocks gone

[fearme7]

Launcher Version: 1.0.1.3

Operating System: windows

Java Version: i dont know

Antivirus Program: avg, avast

Description of Problem:

when i updated and logged into my world all my tekkit items and blocks were gone. the marble in my house, my machines, and the rubber trees i planted outside. i went and checked around and where there was some surface marble nearby and it was a giant hole. so it appears that all tekkit items and blocks were removed from my world in a large radius. but when i get on NEI all the tekkit stuff is there and i can place it down. did something happen to the world file? is there a way to fix this?

Error Messages:

n/a

Error Log:

[Torezu]

I'm guessing you updated tekkit versions. This happens sometimes - try pulling the world file from a backup.

[fearme7]

unfournately i just got the launcher and didnt check the box that said to back up worlds as well so there is no backup file for the world. i generated a new world with the same seed and everything was fine so im guessing that the world file is courrupted and that i need to start over.