Live Gold Market Price Formula Works but Silver Ticker Produces Error

My live Gold Price works but when I went to change the market ticker from Gold (GL=F) (price = US$1957) to Silver (SI=F) I can't get a price and instead get a red triangle warning? (Asset Prices/Srtrike in blue fields are for Silver)

Is Silver not available, this is a Yahoo issue, I guess?

So I went to look at my 30 day chart Sheet (built from an Apple Stocks template) and that's been erratic. I changed the ticker from the £/$ to Gold and it produced a chart. Changed it to Silver and no chart... went back to Gold again and then that wouldn't work either and no data or chart was drawn. Pretty sure my network is good. So again it's a Yahoo issue?

Any ideas?

Cheers.