How do I enable AdMob to respond to inputs?

Hello! I'm currently in the last stage of implementing AdMob to my Unity 4.6.3 game. I'm using the official Google Mobile Ads Unity Plugin v 2.2.1.

The problem is ads do not respond to touch input.

I came across this similar solution and attempted to implement it with no luck.

I suspect that my problem also is due to the AndroidManifest.xml. Am I implementing the previous solution in the wrong place, or the code from the AdMob guide wrong?

AndroidManifest.xml.

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.Ponderline.TiltyMine" android:installLocation="preferExternal">
   <supports-screens android:anyDensity="true" android:largeScreens="true" android:normalScreens="true" android:smallScreens="true" android:xlargeScreens="true" />
   <application android:icon="@drawable/app_icon" android:label="@string/app_name" android:theme="@android:style/Theme.NoTitleBar" android:debuggable="true">
 
         <activity android:label="@string/app_name" android:name="com.unity3d.player.UnityPlayerNativeActivity" android:screenOrientation="portrait" android:launchMode="singleTask" android:configChanges="mcc|mnc|locale|touchscreen|keyboard|keyboardHidden|navigation|orientation|screenLayout|uiMode|screenSize|smallestScreenSize|fontScale">
       <intent-filter>
         <action android:name="android.intent.action.MAIN" />
         <category android:name="android.intent.category.LAUNCHER" />
         <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
       </intent-filter>
       
       <meta-data android:name="unityplayer.UnityActivity" android:value="true" />
       <meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="true" />
     </activity>
     <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />
     <!-- Google Mobile Ads Activity -->
     <activity android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" android:name="com.google.android.gms.ads.AdActivity" />
  
    <meta-data android:name="com.google.android.gms.version"
                 android:value="@integer/google_play_services_version"/>
    
     
       </application>
   <uses-sdk android:minSdkVersion="9" android:targetSdkVersion="21" />
   <!-- Google Mobile Ads Permissions -->
   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
   <uses-feature android:glEsVersion="0x00020000" />
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
 
 <uses-feature android:name="android.hardware.touchscreen" android:required="false" />
   <uses-feature android:name="android.hardware.touchscreen.multitouch" android:required="false" />
   <uses-feature android:name="android.hardware.touchscreen.multitouch.distinct" android:required="false" />
   
   <activity android:name="com.unity3d.player.UnityPlayerActivity" ...>
   ...
   <meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="true" />
 </activity>
   
   
 </manifest>