Well, I tried every other pack other than Magic and Tech Worlds, and I'm getting a crash only on Ultimate every time I try to create a new world. I seem to get a different crash/lack thereof every time, but here's what I just got this time.
I also got a NoClassDefFoundError: p, but, unfortunately, used Apple-C instead of Ctrl-C and didn't copy that one. Disabling Voxel and LiteLoader to see if that does anything.
EDIT: A few other problems I got were a NoClassDefFoundError: forestry/mail/tradestation, and on my next attempt something about 0x0 and then both the launcher and the log immediately closed. After removing everything Voxel-related, mind you.
2013-03-05 17:12:30 [INFO] [STDERR] java.lang.NoClassDefFoundError: com/mumfrey/liteloader/core/CallableLiteLoaderMods
2013-03-05 17:12:30 [INFO] [STDERR] at g.<init>(CallableJVMFlags.java:21)
2013-03-05 17:12:30 [INFO] [STDERR] at a.h(CrashReport.java:55)
2013-03-05 17:12:30 [INFO] [STDERR] at a.<init>(CrashReport.java:41)
2013-03-05 17:12:30 [INFO] [STDERR] at a.a(CrashReport.java:319)
2013-03-05 17:12:30 [INFO] [STDERR] at yc.<init>(World.java:292)
2013-03-05 17:12:30 [INFO] [STDERR] at in.<init>(WorldServer.java:103)
2013-03-05 17:12:30 [INFO] [STDERR] at ih.<init>(SourceFile:10)
2013-03-05 17:12:30 [INFO] [STDERR] at bdz.a(IntegratedServer.java:72)
2013-03-05 17:12:30 [INFO] [STDERR] at bdz.c(IntegratedServer.java:101)
2013-03-05 17:12:30 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:458)
2013-03-05 17:12:30 [INFO] [STDERR] at fy.run(SourceFile:849)
2013-03-05 17:12:30 [INFO] [STDERR] at g.<init>(CallableJVMFlags.java:21)
2013-03-05 17:12:30 [INFO] [STDERR] at a.h(CrashReport.java:55)
2013-03-05 17:12:30 [INFO] [STDERR] at a.<init>(CrashReport.java:41)
2013-03-05 17:12:30 [INFO] [STDERR] at a.a(CrashReport.java:319)
2013-03-05 17:12:30 [INFO] [STDERR] at yc.<init>(World.java:292)
2013-03-05 17:12:30 [INFO] [STDERR] at in.<init>(WorldServer.java:103)
2013-03-05 17:12:30 [INFO] [STDERR] at ih.<init>(SourceFile:10)
2013-03-05 17:12:30 [INFO] [STDERR] at bdz.a(IntegratedServer.java:72)
2013-03-05 17:12:30 [INFO] [STDERR] at bdz.c(IntegratedServer.java:101)
2013-03-05 17:12:30 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:458)
2013-03-05 17:12:30 [INFO] [STDERR] at fy.run(SourceFile:849)
I also got a NoClassDefFoundError: p, but, unfortunately, used Apple-C instead of Ctrl-C and didn't copy that one. Disabling Voxel and LiteLoader to see if that does anything.
EDIT: A few other problems I got were a NoClassDefFoundError: forestry/mail/tradestation, and on my next attempt something about 0x0 and then both the launcher and the log immediately closed. After removing everything Voxel-related, mind you.