When I try running with the latest unofficial build it loads the main menu fine, but when I try to load up my world I get this crash report: http://pastebin.com/7Ww3htF0

Any ideas on what might be the problem?

Commit SHA: 19569e4

The IC2 stuff is highly experimental right now - consider current builds of the trunk to be very unstable until otherwise stated.

So is there anything I can do to fix it? And that commit SHA link, what does it mean?

It just identifies to me the code that was running in the version that you were using.

Try again with a new build, made from the last commit last night

Nope :( Still crashes when loading the world

All experimental IC2 code has been removed for some time now. Can you try again with https://dl.dropboxusercontent.com/u/25591134/EE3/MC%201.6.4/0.1/EquivalentExchange3-1.6.4-0.1.39.jar?

Fixed. Tested with Forge 965+EE3 0.1.50+IC2 EXP build 345. No crashes.

Yeah it worked! Thanks for the help and for the awesome mod