keepcalm

There is a way, but I can't get it to work, you can use @Metadata("MyModID") public static ModMetadata meta; And modify that, or you can get the metadata from @PreInit.

Did your game actually crash? If it did, can you post ForgeModLoader-client-0.log in spoilers? If not, nothing to worry about.

Can you post logs, preferably from sessions where you start a new world, and experience the problem again? Ie start a new world, then fly around until you get the glitched chunks?

If the world is loaded, it's something like World.worldName

Update forge, or try making a new world

Delete your config folder, if that doesn't work, update forge.

DON'T, for the love of god, use MCPatcher. Use optifine. Install forge, and then optifine, or use MultiMC

That would be a mod option, go and talk to your mod makers.

You misunderstand, I meant save it to the world itself, as part of the world's NBT .dat, not your own.

You're registering your entity after you register it's tracker.

((EntityPlayerMP) par3EntityPlayer).playerNetSeverHandler.handleAbilites(new Packet202PlayerAbilites(par3EntityPlayer.capabilities))

NBTs are Minecraft's in-game storage format, and you can use a TileEntity (not sure about blocks) to save data directly to them. So you really only need one block, and all the properties can be set via NBT.

Make sure that EntityVillagerAdult doesn't extend EntityVillager? Looks like an entity is being registered too many times with the EntityTracker.

Something like PlayerInteractEvent? Just check if the type is RIGHT_CLICK_BLOCK

You probably had NEI installed but not CodeChickenCore

Try installing normal forge on the jar. See what happens.

Save it to the world's NBT?

You might want to look at how NEI does it, or look at LuaForge

Check all your mods are for 1.4.2, and update to forge 355

Logs?

Check for smart moving updates, something's broken there.

Read the EAQ, particularly the bit about downloads

There's the onPlayerChangedDimension event in IPlayerTracker?

if (Side.CLIENT.isClient()) { ... }

Logs?