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black screen when connecting to Teamviewer Host App on Android

I am connecting from Galaxy Tab android 7.0 or Win 8 (both Teamviewer 12) to a Galaxy Tab android 7.0. with Teamviewer Host app ver 11.04766.

It worked before but now the window of host is black even thoug i can access the configuration. 

Teamviewer host.png

anyone with same issue?