Whats the right way to break a block? world.destroyBlock() just breaks the block client side and then creates a ghost block that comes back after a block update.

World.setblocktoair(x,y,z)

with World being Minecraft.getMinecraft().theWorld, it creates a ghost block as I said. My question should really being how to send a packet to update the server side block.

Where are you pruning this from?

if you meant running, I'm running it from eclipse.

The function might be in a client side part, but I tried in in the server-side common proxy too.

Where are you running the method from a item block or where!?

A tick handler thats used to control various things.

There is a world object that is from the World class instead of minecraft.

There is a world object that is from the World class instead of minecraft.

I know, I've tried doing it with Minecraft.getMinecraft().thePlayer.worldObj.setBlockToAir(x,y,z); but it still doesn't work. Am I getting the wrong world obj? And if so, where do I get the right one?

Got it:

FMLClientHandler.instance().getServer().worldServerForDimension(0).destroyBlock(x, y, z, false);