I do think this will be related to your pop-up blocker and its (in)correct configuration, AussieDog.
Also, try launching the game in various browsers. Does the issue as described occur in every browser?
Another solution: go directly to the address where the game takes place, without opening the game in a pop-up window. Just click on this link and the game should begin: http://www.wgt.com/gameclient.aspx
You can bookmark this address in your browser and then always launch the game via your bookmark, so that you never have to open the game in a pop-up window. (The only advantage of opening the game in a pop-up window is that the window's size is automatically adjusted to fit the size of the golf game screen. However, you can launch this game in any window and then fit the window's size to your liking manually later on. You can also switch to the full-screen mode in your browser and only then launch the game; works especially well on an LCD TV; the vast expanses of Bethpage fairways and greens look awesome on those dozens of inches of a TV screen!)