Hi tgazza,
Double check and make sure you haven't turned on your pop-up blocker accidentally. If the blocker is off then clear out your flash & browser caches as you may have a corrupted file or two that is causing it not to load properly. That's not an unusual occurrence and clearing your caches should get you straightened out.
Once you clear your caches, be sure to reset any in-game options you prefer such as overall graphical quality or flagstick animations before you tee it up again.