Strange issue after inflating Google Maps MapFragment

Question

im using Google Maps inside a Fragment. It works well and everythings fine. But when i'm leaving the map fragment, it's getting very strange!

I'm also using json.io lib to parse JSON from / to Server. After closing the map fragment i get the following error from json.io:

java.io.IOException: Class listed in @type [com.myapp.constructors.GeoConstructor] is not found, pos = 43

The App works fine until i open and close the map fragment. If i insert call of maps.MapFragment to any other Activity / Fragment, the strange error also happens!

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/map"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  class="com.google.android.gms.maps.SupportMapFragment"/>

So the error must be the call of the Fragment. I also tried inflating the MapFragment programmatically:

mMapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentByTag(MAP_FRAGMENT_TAG);

if (mMapFragment == null) {
        mMapFragment = SupportMapFragment.newInstance();

        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.add(android.R.id.content, mMapFragment, MAP_FRAGMENT_TAG);
        fragmentTransaction.commit();
    }

But this won't solve the error.

Propably the use of Google's MapFragment / SupportMapFragment manipulates something inside my app. What could cause this behaviour?

Hope u can help me.

Got it:

Seems that the ClassLoader changed after inflating the Map. Don't know why, but after manually calling

Thread.currentThread().setContextClassLoader(BaseActivity.cLoader);

after closing the map fragment, error disappers. Hope it helps :)