Sometimes you may need to manually enable your third party cookies in order to receive your gifts. Please check how to do it HERE
Once you have enabled third party cookies, please restart your browser, and if it still doesn't work, please try the following:
1- Make sure you have the most recent version of your browser and Flash Player (You might also try to uninstall and reinstall them).
2- Clear cache and cookies of your computer. How to do this, is described HERE
3- Close all uploads, downloads or programs other than the ones used to play the game.
4- Check your internet connection (Try to unplug and plug back your internet router to reset the connection).
5- Try to connect to the game with a different browser (Chrome, Mozilla, Internet Explorer)
6- Try to connect to the game from another computer.