tested on 4.2.2 and 2.3.3 with Tablet UI and Fallback UI

src/com/github/shadowsocks/AppManager.java

@@ -24,10 +24,11 @@ import android.view.WindowManager;
 import android.widget.*;
 import android.widget.AbsListView.OnScrollListener;
 import android.widget.CompoundButton.OnCheckedChangeListener;
+import com.actionbarsherlock.app.SherlockActivity;
 
 import java.util.*;
 
-public class AppManager extends Activity implements OnCheckedChangeListener,
+public class AppManager extends SherlockActivity implements OnCheckedChangeListener,
         OnClickListener {
 
     public final static String PREFS_KEY_PROXYED = "Proxyed";

src/com/github/shadowsocks/Shadowsocks.java

@@ -552,6 +552,7 @@ public class Shadowsocks extends UnifiedSherlockPreferenceActivity
 
         @Override
         public void onPause() {
+            super.onPause();
             // Unregister the listener whenever a key changes
             getPreferenceScreen().getSharedPreferences()
                     .unregisterOnSharedPreferenceChangeListener(this);
@@ -601,6 +602,7 @@ public class Shadowsocks extends UnifiedSherlockPreferenceActivity
 
         @Override
         public void onPause() {
+            super.onPause();
             // Unregister the listener whenever a key changes
             getPreferenceScreen().getSharedPreferences()
                     .unregisterOnSharedPreferenceChangeListener(this);