Gold Futures Symbol Symbols ZGZ07.CBT ZIZ07.CBT HGZ07.CMX (Dec 07 Gold, Silver, Copper) Prices Not Updated Since Aug 10?

Symbols ZGZ07.CBT ZIZ07.CBT HGZ07.CMX (Dec 07 Gold, Silver, Copper) prices not updated since Aug 10? - gold futures symbol

These are the symbols of commodity futures that I selected a portfolio of Yahoo. The prices are updated correctly - as the price of shares Symbols - until a few weeks. The price will be out of date. Since then, every time I look at the portfolio to see prices in the 10 August. I already have many other symbols of the future have the same problem. Everything I need is the daily price for gold, silver and copper to be seen. Spot prices actually better for the future. But I have found no evidence.