Make sure your account is saved and backed up to Facebook.

If you are connected to Facebook and not receiving gifts check your app permissions on Facebook to make sure they are not blocking Marvel Puzzle Quest.

To check this:

1: Log into your account on Facebook.
2: On your account homepage [your feed] find the apps tab and select "Games."
3: Select the "Your Games" Tab and find Marvel Puzzle Quest.
4: Click the Marvel Puzzle Quest options tab [Gear Icon].
5: Check that all the check boxes are marked.

Your Facebook app permissions are now set for you to receive gifts.