Jyggalag

Launcher Version: 1.0.1.3 Operating System: Windows Vista Java Version: (no idea) Antivirus Program: Description of Problem: when i logged into my saved worlds in technic pack, all of the modded items, (pipes, mable blocks, etc..) were wiped from the world, as if they were never planted down. Please help as this has completley screwed up everything i have done, i have backups but they do the same when minecraft convertst them to anvil file format. Error Messages: Error Log: