All was fine so I decided to reboot while no one was on.
I stopped FTB correctly, rebooted server, logged in, and then restarted FTB.
Command window shows crash almost at the end of the entire process. World chunks are loaded and then crash.
Crash report is attached. I was not able to paste the text in so hope attachment is good.
I think the last thing that was being done on the server last night was something specific with books.... I was not the one playing around and it was actually a new UI I have not seen yet. I can get more details on that if the crash dump is not good enough.
We really don't wan to roll back to an older backup so I hope you have some advice.
Thanks!