SAP BI Mobile Android - white screen for DS / Lumira applications

Hi,

we are facing the following problem:

In the BI Mobile Android app, we are only getting white screens when choosing an application. There are no problems with the connection to the BI Platform, but the usage of the application is not working. Neither an older Design Studio app nor an newer Lumira 2.0 (from Designer) app.

We dont face theese problem on iPads (iOS). Everythig is fine there.

We are on BIP 4.2 SP04 with Android 7.0 und 6.0 devices with the latest SAP BI Mobile app.