Not sure if it was caused by this, but after i stepped on a pressure plate in spawn the server went down. The plates are not marked and I was assuming they did the random tp into the world.
Note to self, label pressure plate of doom at spawn. Quick look at the logs and it appears it was not you that brought the server down, but someone's machine going off the wall. No, no the pressure plate is fine... <evil laugh>
good to note, i figure its best to report anything crashy with any ftb pack *cough*#unstableashellcrap*cough*