http://pastebin.com/eTFevtg3

Client side crash only, thaumcraft is mentioned, so maybe a issue on that end, not sure, reverting to 2.4.2 fixed the crash.

Wow. This should not have been able to happen. Forge did not properly translate the names back when compiling the jar.

I completely rebuilt my environment, and the new JAR looks better. Released as 2.4.4.