When i enable this mod, there seems to modify the blocks somehow?
pickaxe is useless agains all stone blocks.

Note,
i have commented out "EldritchMobsBlocks.init();" and i run this mod on server side only.

any ideas? :)

Yeah, i downloaded the latest comitted version here on git and made myself a new jar after commenting out that line.
It works when i use the regular file downloaded from curse

I wasn't able to replicate this error, are you using the latest version of Eldritch Mobs?

That's a bit strange. Just to clarify, the version you downloaded from curseforge is working normally but the version that you built from the latest committed version on GitHub doesn't?