We will do our best to verify all the browser and OS combinations but in the meantime, if you are having issues I suggest double checking to make sure you have pop-up blockers disabled for wgt.com and that you have the latest version of flash http://www.adobe.com/products/flashplayer/
IE and Firefox are the preferrred browsers on the Windows OS and Mac
We will continue to trouble shoot Mac issues. Please post your configuration info (operating system, browser version and intel, AMD or Power PC chip) on this tread so we can keep track of what works and what to avoid.
Thanks