Pausing/stopping movie using android media control not working

[DrNoD 5]

Still not working. (all updated)

For me it looks now like this: 

When opening emby on dex in minimized mode and i hit play on a video, the video starts in full screen. But there are no controls (play / pause) when moving mouse.
The black borders on top and bootom are visible now. But the task bar of dex is still visible. So not real full screen.

When hitting the "back" on the keyboard (WIN + arrow left) emby returns into window mode and the screen is just black. But i can hear the sound of the video still playing. And when moving mouse on the now minimized window, controls appear (and controls work).

Hitting the "back" on the keyboard (WIN + arrow left) then, i can return to the movie overview and start/continue the movie again.

then all the same behavior like described before.

Tried starting emby on my phone (when connected to the dex screen) then, the movie starts in full screen on dex screen (taskbar visible, black border on top/bottom visible, but no controls) and on the phone there is black screen with the controls that are working.

When hitting the "back" on the keyboard (WIN + arrow left) on the phone, the fullscreen on dex still displays the last shown stopped video. When moving the move to the dex and hitting the "back" on the keyboard (WIN + arrow left) the image disappears.

Note. dex is starting all apps again, and closing on the other screen. for example starting a browser on mobile and then on dex it closes the window on dex and vice versa. Same with emby. But somehow the fullscreen when starting a video always start on the dex screen.

Tried in chrome for example to open emby. there the fullscreen is not switching to the dex screen. 

Edited 1 hour ago by DrNoD