You can fix it by going to your game settings...
Click on the Privacy Settings
Then change your setting to not allow friends to port then repeat and set to allow friends to port to you. This will reset and allow one friend to teleport. So with each additional friend wanting to port you will have to repeat this process.
Fallon Shadowblade also posts about this same issue because it has had such a huge impact on the playability of Wizard lately. http://www.diaryofawizard.com/ Check out her site.