To fix this problem:

1) Go to Ad-Free Settings
2) Click on "Ads/Spyware" in top left area
3) Scroll down and search for the entry g.msn.com*
4) Select it and click on "Edit"
5) Delete the Asterisk (*) at the end of it and click OK
6) Click the "allow" button
7) Close Ad-Free Settings and Save your changes.