Reproduction steps:
1. Open the attached project;
2. Build the scene "VideoDemo" on Android platform (GoogleVR -> Demos -> Scenes);
3. Build project to device;
4. Close the built app in device;
5. Repeat 3rd and 4th steps a few times;

Actual result: the first time the app is launched, as a fallback Cardboard VR view is displayed. Subsequent launches start in 2D view.
Expected result: every time the app is launched, it should fall back to Cardboard VR view.

Reproduced with: 5.6.0f3, 5.6.1p1, 2017.1.0b6
Not reproducible with: 5.6.0f1, 5.6.0f2
Regression introduced with 5.6.0f3

Note: when the app is built with 2017.1.0b6, it always launches in 2D view. Issue reproduces when the first VR SDK is not supported and it falls back to second SDK which is set as Cardboard. Daydream and Oculus unaffected.

Devices under test:

Reproducible with:
Sony D6603 (Xperia Z3)*, OS:6.0.1, CPU:armeabi-v7a, GPU:Adreno (TM) 330, Build:Sony/D6603/D6603:6.0.1/23.5.A.1.291/2769308465:user/release-keys

Samsung SM G925F (Galaxy S6 Edge)*, OS:6.0.1, CPU:arm64-v8a, GPU:Mali-T760, Build:samsung/zeroltexx/zerolte:6.0.1/MMB29K/G925FXXS4DPJ2:user/release-keys

Samsung SM G930F*, OS:7.0, CPU:arm64-v8a, GPU:Mali-T880, Build:samsung/heroltexx/herolte:7.0/NRD90M/G930FXXU1ZPK3:user/release-keys

Not reproducible with:
Google Pixel*, OS:7.1.2, CPU:arm64-v8a, GPU:Adreno (TM) 530, Build:google/sailfish/sailfish:7.1.2/N2G47E/3766409:user/release-keys (Does not reproduce because Cardboard is not compatible with Pixel)

HUAWEI EVA L19*, OS:7.0, CPU:arm64-v8a, GPU:Mali-T880, Build:HUAWEI/EVA-L19/HWEVA:7.0/HUAWEIEVA-L19/C432B378:user/release-keys