Before you say, "Oh, you OnBlockActivated runs twice! Once on the server and client!" That is NOT my problem. The client runs twice and the server runs twice.

 

OnBlockActivated:

	@Override
public boolean onBlockActivated(World world, BlockPos pos, IBlockState state, EntityPlayer playerIn, EnumHand hand, ItemStack heldItem, EnumFacing side, float hitX, float hitY, float hitZ) {
	System.out.println("Is Remote: " + world.isRemote);
	LockedDoorTileEntity te = (LockedDoorTileEntity) world.getTileEntity(pos);
	DoorCorner corner = te.corner;
	if(playerIn.isSneaking() && playerIn.isCreative() && !world.isRemote){
		if(corner == DoorCorner.BottomLeftX){
			((LockedDoorTileEntity) world.getTileEntity(pos.add(1, 0, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, 1, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(1, 1, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos)).toggleKey();
		}
		if(corner == DoorCorner.BottomRightX){
			((LockedDoorTileEntity) world.getTileEntity(pos.add(-1, 0, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, 1, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(-1, 1, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos)).toggleKey();
		}
		if(corner == DoorCorner.TopLeftX){
			((LockedDoorTileEntity) world.getTileEntity(pos.add(1, 0, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, -1, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(1, -1, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos)).toggleKey();
		}
		if(corner == DoorCorner.TopRightX){
			((LockedDoorTileEntity) world.getTileEntity(pos.add(-1, 0, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, -1, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(-1, -1, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos)).toggleKey();
		}

		if(corner == DoorCorner.BottomLeftZ){
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, 0, 1))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, 1, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, 1, 1))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos)).toggleKey();
		}
		if(corner == DoorCorner.BottomRightZ){
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, 0, -1))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, 1, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, 1, -1))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos)).toggleKey();
		}
		if(corner == DoorCorner.TopLeftZ){
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, 0, 1))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, -1, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, -1, 1))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos)).toggleKey();
		}
		if(corner == DoorCorner.TopRightZ){
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, 0, -1))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, -1, 0))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos.add(0, -1, -1))).toggleKey();
			((LockedDoorTileEntity) world.getTileEntity(pos)).toggleKey();
		}
		LockedDoorTileEntity tehere = (LockedDoorTileEntity)world.getTileEntity(pos);
		String keyName = tehere.useSilverKey ? TextFormatting.DARK_GRAY + "silver " : TextFormatting.GOLD + "gold ";
		playerIn.addChatComponentMessage(new TextComponentString("This door now takes the " + keyName + TextFormatting.RESET + "key."));
		TaleCraft.network.sendToDimension(new DoorPacket(pos, tehere.useSilverKey), world.provider.getDimension());
		return false;
	}
	if(world.isRemote){
		if(heldItem != null && heldItem.getItem() instanceof KeyItem){
			if((heldItem.getItem() == TaleCraftItems.silverKey && te.useSilverKey) || (heldItem.getItem() == TaleCraftItems.goldKey && !te.useSilverKey))world.playSound(pos.getX(), pos.getY(), pos.getZ(), SoundEvents.block_chest_open, SoundCategory.BLOCKS, 100f, 1f, false);
		}
		return false;
	}
	if(heldItem != null && heldItem.getItem() instanceof KeyItem){
		if((heldItem.getItem() == TaleCraftItems.silverKey && te.useSilverKey) || (heldItem.getItem() == TaleCraftItems.goldKey && !te.useSilverKey)){
			world.setBlockToAir(pos);
			onBlockDestroyedByPlayer(world, pos, state);
			heldItem.stackSize--;
			return false;
		}
	}
	return true;
}

 

Console Output:

 

[17:11:50] [Client thread/INFO] [sTDOUT]: [tiffit.talecraft.blocks.world.LockedDoorBlock:onBlockActivated:42]: Is Remote: true

[17:11:50] [Client thread/INFO] [sTDOUT]: [tiffit.talecraft.blocks.world.LockedDoorBlock:onBlockActivated:42]: Is Remote: true

[17:11:50] [server thread/INFO] [sTDOUT]: [tiffit.talecraft.blocks.world.LockedDoorBlock:onBlockActivated:42]: Is Remote: false

[17:11:50] [server thread/INFO] [sTDOUT]: [tiffit.talecraft.tileentity.LockedDoorTileEntity:toggleKey:32]: Is Remote: false

[17:11:50] [server thread/INFO] [sTDOUT]: [tiffit.talecraft.tileentity.LockedDoorTileEntity:toggleKey:32]: Is Remote: false

[17:11:50] [server thread/INFO] [sTDOUT]: [tiffit.talecraft.tileentity.LockedDoorTileEntity:toggleKey:32]: Is Remote: false

[17:11:50] [server thread/INFO] [sTDOUT]: [tiffit.talecraft.tileentity.LockedDoorTileEntity:toggleKey:32]: Is Remote: false

[17:11:50] [server thread/INFO] [sTDOUT]: [tiffit.talecraft.blocks.world.LockedDoorBlock:onBlockActivated:42]: Is Remote: false

[17:11:50] [server thread/INFO] [sTDOUT]: [tiffit.talecraft.tileentity.LockedDoorTileEntity:toggleKey:32]: Is Remote: false

[17:11:50] [server thread/INFO] [sTDOUT]: [tiffit.talecraft.tileentity.LockedDoorTileEntity:toggleKey:32]: Is Remote: false

[17:11:50] [server thread/INFO] [sTDOUT]: [tiffit.talecraft.tileentity.LockedDoorTileEntity:toggleKey:32]: Is Remote: false

[17:11:50] [server thread/INFO] [sTDOUT]: [tiffit.talecraft.tileentity.LockedDoorTileEntity:toggleKey:32]: Is Remote: false

[17:11:50] [Client thread/INFO]: [CHAT] This door now takes the §6gold §rkey.

[17:11:50] [Client thread/INFO]: [CHAT] This door now takes the §8silver §rkey.

 

 

Can't seem to find the solution to this, but it is toggling and then immediately retoggling a boolean thus keeping it the same.

Try returning true instead of false within your if statements - that signals Minecraft that something happened.

Try returning true instead of false within your if statements - that signals Minecraft that something happened.

That works, thanks!