Raycoms

How many people on fabulous mode?

Which minecraft launcher are you using?

and you're not on fabulous?

can you try updating forge/java ?

It can't be account specific, it must be computer specific. This is a missing library that should be on there afaik.

So, logging in with a different account solves it?

I'm not sure I understand. Do you mean people are exchanging passwords and are logging in with the account fo another person, and with that it works, but not with...

can you try to tell people to switch to a different pack?

Is this in LAN mode?

@SivartMcDorf need to sign the cla