Reproduction steps:
1. Open the attached project "Repro934186.zip";
2. Build the scene "Scene_01" on a device;
3. Open the built app in a device;
4. Observe the red text and click "Show video" button;

Actual result: the red text is "adv is initialized" and the video of the ad does not load on the screen.
Expected result: the red text should change to "video is ready" and the video of the ad should be played after pressing "Show video" button.

Note: the issue does not appear in Editor.

Reproduced with: 5.5.0b1, 5.5.4p2, 5.6.3f1, 2017.1.0p2, 2017.2.0b5.

Note#2: the app crashes when it is built with 2017.3.0a2

Devices under test:
Reproducible:

Google Nexus 6, OS:6.0.1, CPU:armeabi-v7a, GPU:Adreno (TM) 420, Build:google/shamu/shamu:6.0.1/MOB30O/2920157:user/release-keys

Amazon KFMEWI (Fire HD 8 (2015)), OS:5.1.1, CPU:armeabi-v7a, GPU:PowerVR Rogue G6200, Build:Amazon/full_thebes/thebes:5.1.1/LVY48F/32.5.6.3_user_563231720:user/release-keys

Amazon KFFOWI (Fire (2015)), OS:5.1.1, CPU:armeabi-v7a, GPU:Mali-450 MP, Build:Amazon/full_ford/ford:5.1.1/LVY48F/37.5.7.9_user_579225620:user/release-keys

Not reproducible:

Google Pixel XL, OS:8.0.0, CPU:arm64-v8a, GPU:Adreno (TM) 530, Build:google/marlin/marlin:O/OPP2.170420.019/4021594:user/release-keys

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

Google Nexus 5, OS:6.0.1, CPU:armeabi-v7a, GPU:Adreno (TM) 330, Build:google/hammerhead/hammerhead:6.0.1/MOB31E/3142026:user/release-keys

Sony C6603 (Xperia Z), OS:5.1.1, CPU:armeabi-v7a, GPU:Adreno (TM) 320, Build:Sony/C6603/C6603:5.1.1/10.7.A.0.228/58103698:user/release-keys

Meizu MX5, OS:5.0.1, CPU:arm64-v8a, GPU:PowerVR Rogue G6200, Build:Meizu/meizu_mx5/mx5:5.0.1/LRX22C/m85.Flyme_OS_4.5.4.1.20151010121404:user/release-keys