ForgeModLoader state engine corrupted error. Stuck at "Loading World"

[doxus_]

So I've been playing the Mindcrack pack for a few months and haven't had this problem up until now. The pack loaded fine the last time my computer had been on, but this time I am getting an error and am stuck at "Loading World"

My crash report is here, http://pastebin.com/htK15V5n , although the game doesn't actually crash. Just gets stuck.

I have tried:

- Waited a long time
- Updated Java
- Force Updated Modpack
- Installed Ultimate pack and tried loading the world from there
- Disabled and re-enabled Optifine which has worked with no problems up till now. (With Optifine re-enabled it gets stuck at "Building Terrain" instead for a minute and sometimes actually crashes with the same errors.)
- Created a New World, which worked fine.

I am running a 64 bit version of Windows 7 with both 64 bit and 32 bit versions of Java installed. Which have all worked fine up until last night.

I can't think of anything else to do and all of my searches have turned up fruitless. Any help would be HUGELY appreciated. I have a backup from a couple weeks ago which I'm not sure works...but it would be terrible to lose so much progress

 

[doxus_]

So I have since copied regions folder, level.dat files, players folder, portal gun files, data folder, computer folder, EnderStorage folder, research.dat over to the new world I had created to see what happens. It lets the world load now without the original error, but my inventory and location data were lost. Anyone know what files to copy over from my old save for this and any other critical files I should know about?

Thanks

edit: narrowed it down to something in the RedstoneEther folder. gprop, node1 and node2 dats all copy over fine, something going on with the other three. Anyone know if one of them is important or what their function is? I haven't noticed anything wrong yet, but I haven't really looked around that much so far.