I started crashing after updating to Forge 486. Had to update due to a bug with booster tracks and older versions of Forge.
full log: http://paste.ubuntu.com/1468241/
Two things to note, first there's a java.lang.reflect.InvocationTargetException (lines 1507-1542) during the MC initialization, then when I try to create a world or load a world I get an Exception ticking world (lines 1941-1951) and a java.lang.NullPointerException (lines 1954-1963).
I'm using build 12 of PfF, denLib 2.1.2. Everything ran under Forge 480 without crashing.
EDIT: I'm trying to downgrade to verify if it really is Forge that's the problem, but files.minecraftforge.com has been up and down all day. They're having troubles with Dreamhost apparently. I'll update this post once I can downgrade and verify which version of Forge the problem starts in.
EDIT: OK, I've been able to determine that Forge 482 is the last one that seems to work. Forge 483+ crashes when loading/creating a world
Edited by Khalamov, 26 December 2012 - 11:13 PM.