Android Update of 2018-12-03: The background (landscape, road, avatar) is black

I have a oneplus 2. Until yesterday everything was working great. Zwift +chromecast+ Spotify were working together.

The new version does not show the screen layer containing the road/landscape /avatar. Instead, this is black. Only the front (menu) is shown. Please see attachments.

Please fix.

(if you need, I can create traces etc on my android phone. I can access my mobile using adb or using other development tools)

Mybe the obb file is not unzipped:
$ adb shell “ls /sdcard/Android/obb/com.zwift.zwiftgame/”