Program: 161315
Project: 161315
Buggy source:
@Override public void initGui(){
  super.initGui();
  int xCenter=guiLeft + this.xSize / 2;
  int yCenter=this.ySize / 2;
  int metadata=_port.getWorldObj().getBlockMetadata(_port.xCoord,_port.yCoord,_port.zCoord);
  ejectFuel=new GuiIconButton(2,guiLeft + xSize - 97,guiTop + 53,18,18,ClientProxy.GuiIcons.getIcon("String_Node_Str"),new String[]{EnumChatFormatting.AQUA + "String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"});
  ejectWaste=new GuiIconButton(3,guiLeft + xSize - 77,guiTop + 53,18,18,ClientProxy.GuiIcons.getIcon("String_Node_Str"),new String[]{EnumChatFormatting.AQUA + "String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"});
  btnInlet=new GuiIconButton(0,guiLeft + xSize - 47,guiTop + 53,18,18,ClientProxy.GuiIcons.getIcon("String_Node_Str"),new String[]{EnumChatFormatting.AQUA + "String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"});
  btnOutlet=new GuiIconButton(1,guiLeft + xSize - 27,guiTop + 53,18,18,ClientProxy.GuiIcons.getIcon("String_Node_Str"),new String[]{EnumChatFormatting.AQUA + "String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"});
  inventoryLabel=new BeefGuiLabel(this,"String_Node_Str",guiLeft + 8,guiTop + 64);
  registerControl(ejectFuel);
  registerControl(ejectWaste);
  registerControl(btnOutlet);
  registerControl(btnInlet);
  registerControl(inventoryLabel);
  updateIcons();
}

Fixed version (ground truth):
@Override public void initGui(){
  super.initGui();
  ejectFuel=new GuiIconButton(2,guiLeft + xSize - 97,guiTop + 53,18,18,ClientProxy.GuiIcons.getIcon("String_Node_Str"),new String[]{EnumChatFormatting.AQUA + "String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"});
  ejectWaste=new GuiIconButton(3,guiLeft + xSize - 77,guiTop + 53,18,18,ClientProxy.GuiIcons.getIcon("String_Node_Str"),new String[]{EnumChatFormatting.AQUA + "String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"});
  btnInlet=new GuiIconButton(0,guiLeft + xSize - 47,guiTop + 53,18,18,ClientProxy.GuiIcons.getIcon("String_Node_Str"),new String[]{EnumChatFormatting.AQUA + "String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"});
  btnOutlet=new GuiIconButton(1,guiLeft + xSize - 27,guiTop + 53,18,18,ClientProxy.GuiIcons.getIcon("String_Node_Str"),new String[]{EnumChatFormatting.AQUA + "String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"});
  inventoryLabel=new BeefGuiLabel(this,"String_Node_Str",guiLeft + 8,guiTop + 64);
  registerControl(ejectFuel);
  registerControl(ejectWaste);
  registerControl(btnOutlet);
  registerControl(btnInlet);
  registerControl(inventoryLabel);
  updateIcons();
}