I have never been able to access features on WGT website while logged into my WGT on facebook. I have figured out a work around.
While logged in and running wgt on facebook. Open a separate window and go to wgt.com. Click on "continue on to WGT" in the window on the top. WGT will come up. Click "log on with facebook". This will take you back to WGT on facebook. Hit your browser's back button. Now you will be logged in on the WGT website. I am using Google chrome.