Config file is ignored on startup causing all blocks to use default IDs and settings (and causing ID conflicts). Deleting the config file will have a new one be created, but it'll only put "# Configuration file" and two blank lines in it. I'll run through the builds to see which one specifically started causing the issue.

Forge 944, Builds ~335+, Mods (version numbers outdated): https://dl.dropboxusercontent.com/u/143135/trash/mods.txt

Already fixed

Stop working so fast, it's hard to keep up. ;D