Program: 149491
Project: 149491
Buggy source:
@Override protected void drawGuiContainerForegroundLayer(int par1,int par2){
  String s="String_Node_Str";
  fontRenderer.drawString(s,-10 + xSize / 2 - fontRenderer.getStringWidth(s) / 2,-10,0xffffff);
  fontRenderer.drawString(I18n.getString("String_Node_Str"),0,ySize - 20 + 2,0xffffff);
  this.buttonList.clear();
  int k=(width - xSize) / 2;
  int l=(height - ySize) / 2;
  if (tile.needPower()) {
    fontRenderer.drawString("String_Node_Str",50,20,0xffffff);
    return;
  }
  if (name) {
    if (!tile.isInRange(choosenTarget)) {
      name=false;
      text=null;
      choosenTarget=0;
      return;
    }
    BlockPosition pos=tile.getTarget(choosenTarget);
    ItemStack stack=pos.getAsBlockStack().getAsDroppedStack();
    if (stack == null)     stack=pos.getAsBlockStack().getAsDroppedStack(pos);
    if (stack == null)     stack=pos.getAsBlockStack().asItemStack();
    this.renderItem(stack,60,20);
    if (text == null) {
      text=new GuiTextField(fontRenderer,20,40,100,10);
      text.setCanLoseFocus(true);
      text.setFocused(true);
      if (tile.hasCustomName(pos.getAsList())) {
        text.setText(tile.getCustomName(pos.getAsList()));
      }
      return;
    }
    text.drawTextBox();
    buttonList.add(new GuiButton(8,k + 10,l + 70,50,20,"String_Node_Str"));
    buttonList.add(new GuiButton(9,k + 70,l + 70,50,20,"String_Node_Str"));
  }
 else {
    fontRenderer.drawString("String_Node_Str" + page,72,7,0xffffff);
    buttonList.add(new GuiButton(6,k + 90,l,20,20,"String_Node_Str"));
    buttonList.add(new GuiButton(7,k + 40,l,20,20,"String_Node_Str"));
    for (int i=0; i < 6; i++) {
      if (!tile.isInRange((page * 6) + i)) {
        return;
      }
      BlockPosition pos=tile.getTarget((page * 6) + i);
      String name=pos.getAsBlockStack().getDroppedBlockDisplayName();
      if (name.equalsIgnoreCase("String_Node_Str")) {
        name=pos.getAsBlockStack().getDroppedBlockDisplayName(pos);
      }
      if (name.equalsIgnoreCase("String_Node_Str")) {
        name=pos.getAsBlockStack().getBlockDisplayName();
      }
      if (tile.hasCustomName(pos.getAsList())) {
        name=tile.getCustomName(pos.getAsList());
      }
      buttonList.add(new GuiButton(i,k,l + 25 + 20 * i,145,20,name));
      ItemStack stack=pos.getAsBlockStack().getAsDroppedStack();
      if (stack == null) {
        stack=pos.getAsBlockStack().getAsDroppedStack(pos);
      }
      if (stack == null) {
        stack=pos.getAsBlockStack().asItemStack();
      }
      this.renderItem(stack,-17,28 + (20 * i));
    }
  }
}

Fixed version (ground truth):
@Override protected void drawGuiContainerForegroundLayer(int par1,int par2){
  String s="String_Node_Str";
  fontRenderer.drawString(s,-10 + xSize / 2 - fontRenderer.getStringWidth(s) / 2,-10,0xffffff);
  fontRenderer.drawString(I18n.getString("String_Node_Str"),0,ySize - 20 + 2,0xffffff);
  this.buttonList.clear();
  int k=(width - xSize) / 2;
  int l=(height - ySize) / 2;
  if (tile.needPower()) {
    fontRenderer.drawString("String_Node_Str",50,20,0xffffff);
    return;
  }
  if (name) {
    if (!tile.isInRange(choosenTarget)) {
      name=false;
      text=null;
      choosenTarget=0;
      return;
    }
    BlockPosition pos=tile.getTarget(choosenTarget);
    ItemStack stack=pos.getAsBlockStack().getPicketBlock(pos,tile.getSideFromPlayer(mc.thePlayer.username));
    this.renderItem(stack,60,20);
    if (text == null) {
      text=new GuiTextField(fontRenderer,20,40,100,10);
      text.setCanLoseFocus(true);
      text.setFocused(true);
      if (tile.hasCustomName(pos.getAsList())) {
        text.setText(tile.getCustomName(pos.getAsList()));
      }
      return;
    }
    text.drawTextBox();
    buttonList.add(new GuiButton(8,k + 10,l + 70,50,20,"String_Node_Str"));
    buttonList.add(new GuiButton(9,k + 70,l + 70,50,20,"String_Node_Str"));
  }
 else {
    fontRenderer.drawString("String_Node_Str" + page,72,7,0xffffff);
    buttonList.add(new GuiButton(6,k + 90,l,20,20,"String_Node_Str"));
    buttonList.add(new GuiButton(7,k + 40,l,20,20,"String_Node_Str"));
    for (int i=0; i < 6; i++) {
      if (!tile.isInRange((page * 6) + i)) {
        return;
      }
      BlockPosition pos=tile.getTarget((page * 6) + i);
      String name=pos.getAsBlockStack().getPickedBlockDisplayName(pos,tile.getSideFromPlayer(mc.thePlayer.username));
      if (tile.hasCustomName(pos.getAsList())) {
        name=tile.getCustomName(pos.getAsList());
      }
      buttonList.add(new GuiButton(i,k,l + 25 + 20 * i,145,20,name));
      ItemStack stack=pos.getAsBlockStack().getPicketBlock(pos,tile.getSideFromPlayer(mc.thePlayer.username));
      if (stack == null) {
        continue;
      }
      this.renderItem(stack,-17,28 + (20 * i));
    }
  }
}