Chrome refresh right-click reload options not available
Just figured out the basic reason for this - Developer Tools Console must be open to access right-click options on the browser refresh button. The easiest way I find to open Dev Tools in Chrome is to right-click anywhere on the page and select Inspect.
I guess it is a feature mostly just for developers and the Chrome team doesn't want regular users accidentally clearing their cache!
Press F12 to open the developer tools and then you can right-click the reload button, and you get three options - Reload, Hard Reload (redownloads images) and Empty Cache and Hard Reload.