No error message is displayed. Real time charts change every minute during the trading day. The default checked status means that the charts are always reloaded when viewed. If you click and uncheck the line, then the charts can be viewed from the cache of chart images kept by FastTrack. Viewing from cache is much faster.
Nothing is retrieved from the web.
Once the image is loaded it does not change. URLs can be quite long, too long to conveniently display on the browser. You might wish to do this if you are a web page author and want to copy fully formatted page images. You can select the same fundamentals here as you can on the Available Links page. Right-clicking may be more convenient and quicker.