http://pastebin.com/9QdeF5uv

Crash during forge loading.
Even though the report says psi, it happened after i updated quark today and I have to disable quark AND psi to get the game to load.

forge 12.18.1.2027
1.10.2

Edit: I was able to start quark and psi in my custom pack by rolling back the forge version.

Probably related to @cpw's registry changes today?

Lines in question (pretty innocuous) https://github.com/Vazkii/Psi/blob/master/src/main/java/vazkii/psi/common/block/base/BlockMetaVariants.java#L45-L56

I kind of thought the same thing(without the code insight), hence why i thought to roll back the forge version.

Same here.

@cpw example of something I think might be caused by the registry changes

ye, just a matter of fixing the code.

Talked to lex about this and he says that nothing on their end can cause this to break. Can you try it with no other mods loaded other than the problematic two?

Nevermind. We figured it out. I'll have it fixed in a bit!

The issue has been found, his 'automated' registration in the constructor of the block is causing the block to not be fully initialized before being registered, which is bad.
People, DO NOT register your things before the blocks are fully initialized!