Can you spot the problem?

Quote from the previous version of the mod:
datablock fxDTSBrickData( mc_blockData_sand )
{
	brickFile = "Add-Ons/System_Minecraft/blocks/sand.blb";
	category = "Minecraft";
	subCategory = "Blocks";
	uiName = "Sand";
	iconName = "Add-Ons/System_Minecraft/icons/sand";

	isMC = true;
	mcHealth = 4;
	mcBlastResistance = 2.5;
};

Quote from the current version of the mod:
datablock fxDTSBrickData(mc_blockData_Sand)
{
	brickFile = "Add-ons/System_Minecraft/Blocks/Sand.blb";
	category = "Minecraft";
	subCategory="Natural";
	uiName = "Sand";
	iconName = "";
};