Program: 63707
Project: 63707
Buggy source:
@Override public boolean onBlockActivated(World world,int x,int y,int z,EntityPlayer player,int facing,float facingX,float facingY,float facingZ){
  boolean flag=false;
  int meta=world.getBlockMetadata(x,y,z);
  boolean toggleLitState=true;
  ItemStack held=player.getCurrentEquippedItem();
  if (!isLit(meta)) {
    if (held == null || !lightingItems.contains(held.getItem())) {
      toggleLitState=false;
    }
 else     if (StackUtils.equals(this,held) && isLit(held)) {
      toggleLitState=true;
    }
  }
  if (held != null) {
    TileCandle te=(TileCandle)world.getTileEntity(x,y,z);
    if (te == null) {
      world.setTileEntity(x,y,z,this.createTileEntity(world,meta));
    }
    if (StackUtils.equals(this,held)) {
      if (!isLit(held)) {
        if (held.hasTagCompound() && held.getTagCompound().hasKey(colourTagName)) {
          te.setColour(held.getTagCompound().getInteger(colourTagName));
        }
 else {
          te.setColour(0xffffff);
        }
      }
 else {
        toggleLitState=true;
      }
      flag=true;
    }
 else {
      boolean matched=false;
      for (int i=0; i < dyes.length; ++i) {
        for (        ItemStack stack : OreDictionary.getOres(dyes[i])) {
          if (OreDictionary.itemMatches(stack,held,true)) {
            if (isLit(meta)) {
              te.setColour(colours[i][0],colours[i][1],colours[i][2]);
            }
 else {
              te.addColour(colours[i][0],colours[i][1],colours[i][2]);
            }
            world.markBlockForUpdate(x,y,z);
            matched=true;
            toggleLitState=false;
            flag=true;
            break;
          }
        }
        if (matched) {
          break;
        }
      }
    }
  }
  if (toggleLitState) {
    meta=this.toggleLitStatus(meta);
    world.setBlockMetadataWithNotify(x,y,z,meta,Defaults.FLAG_BLOCK_SYNCH | Defaults.FLAG_BLOCK_UPDATE);
    flag=true;
  }
  return flag;
}

Fixed version (ground truth):
@Override public boolean onBlockActivated(World world,int x,int y,int z,EntityPlayer player,int facing,float facingX,float facingY,float facingZ){
  boolean flag=false;
  int meta=world.getBlockMetadata(x,y,z);
  boolean toggleLitState=true;
  ItemStack held=player.getCurrentEquippedItem();
  if (!isLit(meta)) {
    if (held == null || !lightingItems.contains(held.getItem())) {
      toggleLitState=false;
    }
 else     if (StackUtils.equals(this,held) && isLit(held)) {
      toggleLitState=true;
    }
  }
  if (held != null) {
    TileCandle te=(TileCandle)world.getTileEntity(x,y,z);
    if (te == null) {
      world.setTileEntity(x,y,z,this.createTileEntity(world,meta));
      te=(TileCandle)world.getTileEntity(x,y,z);
    }
    if (StackUtils.equals(this,held)) {
      if (!isLit(held)) {
        if (held.hasTagCompound() && held.getTagCompound().hasKey(colourTagName)) {
          te.setColour(held.getTagCompound().getInteger(colourTagName));
        }
 else {
          te.setColour(0xffffff);
        }
      }
 else {
        toggleLitState=true;
      }
      flag=true;
    }
 else {
      boolean matched=false;
      for (int i=0; i < dyes.length; ++i) {
        for (        ItemStack stack : OreDictionary.getOres(dyes[i])) {
          if (OreDictionary.itemMatches(stack,held,true)) {
            if (isLit(meta)) {
              te.setColour(colours[i][0],colours[i][1],colours[i][2]);
            }
 else {
              te.addColour(colours[i][0],colours[i][1],colours[i][2]);
            }
            world.markBlockForUpdate(x,y,z);
            matched=true;
            toggleLitState=false;
            flag=true;
            break;
          }
        }
        if (matched) {
          break;
        }
      }
    }
  }
  if (toggleLitState) {
    meta=this.toggleLitStatus(meta);
    world.setBlockMetadataWithNotify(x,y,z,meta,Defaults.FLAG_BLOCK_SYNCH | Defaults.FLAG_BLOCK_UPDATE);
    flag=true;
  }
  return flag;
}