Make sure you have the latest FLASH 10.
Clear your browser of all temp files.
FireFox and Chrome work best for this game, many have issues with IE
Right click on the PLAY NOW button and select Global Settings
This opens up a new page and look for "Website Storage Settings"
REMOVE all sites.
Restart the PC
When you load WGT again you will have to configure all your settings/preferences again after doing this.
oh and make sure your torrent program isn't uploading ;)