Unity 5.4 Android OBB - Blank scene being loaded with Camera over-draw

We have a large Android game that is split into a smaller APK and a larger main expansion file (OBB). We are using Unity's default splitting mechanism for creating the OBB.

When the application is downloaded via the Google Play store, the OBB file is stored into Android/obb/{app-id}/main.{version}.{app-id}.obb.

The first scene loads, and Unity should have automatically detected and loaded the OBB. We soon load into our second scene. The second scene is blank, no sky box and the UI from the previous scene is present with camera overdraw. There are no errors being reported via LogCat. Is there some other means to ensure or check that the OBB has been loaded?

What I am sure about

1. Proper APK and OBB packaging (same version)

2. OBB has been downloaded for the current version.

3. Any errors in the logcat console? (no)

What I am not sure about

1. Has Unity detected the OBB? How do we do this?

2. Do we have to load the OBB ourselves like an asset bundle?

Hopefully someone can shed light on what I am missing, or what reason it would unload the current scene with an apparent missing one.

Thanks,