I was setting up a new server and it keeps crashing in my hands at startup.
I'm not really sure what I can give else then the crash report, so here it is: https://gist.github.com/30c3dae07a944e08e9a9 ;-)

EDIT: here is a client crash report which might or might not be linked to the issue: https://gist.github.com/f48e65f86e475de57c22

Let me know if you need anymore info...

Getting this as well. Rolled back to 865 and it fixed it.

Build 1.7.2-2.0.0.866:
Adubbz: Moved potions to BOPCPotions. The API is once again completely separated from the mod itself.

4de4f81

Yep, I just rolled back and everything run smoothly...