On the ATM3 modpack, and while using the iridescant altar, whenever anyone interacts with the constellation/attunement area of it, then they crash to desktop. It does it whether it's the starfield, or the slot.

crash-2017-10-19_00.19.01-client.txt

Uh. well. Not much more to say here - closing issue

Outdated issue of Version 1.6.1 - you might want to consider updating to 1.7

Try to replicate it then and please reply if that solved the problem.

We are on the 1.7 version when it happened, but trying it again it suddenly works fine and doesn't crash, so must have been a one day issue for us which was weird since it crashed 3 of us. Not going to question it if it's working now though, thanks for your time anyway