I hope here is anybody who is able to help me.
First of all I need to say that all went right since about 2-4 weeks (I can't remember, maybe it was this windows anniversary update, but maybe there is any other update idk

I'm using VoiceMeeter Banana to share the Sound from my Gaming PC to my Streaming PC.
I'm using A1 with my Audio driver from my external Soundcard (Soundblaster G5) and A2 with Sound via HDMI (nVidea) to my streaming PC.
My streaming pc has an Elgate HD60 Pro.
The streaming PC capture the sound correctly until I need to close the game (any game, it happened to all) or I need to tab out.
I need to go into VoiceMeetere and choose the Output A2 again (it's still choosen, but there is no audioline that gets to the streaming pc)
If I pick A2 again, all works fine till I need to close the game again.
But: A1 is working all the time without problems.
If I use the nVidea Output as default all is ok, I can close my games and tab out, the audio line is still at the second pc.
Also I re-installed VoiceMeeter Banana, also I re-setup both PCs (Win 10 Pro 64 Bit).
Can anybody helps me please? I have no clue about that problem.
Thanks
Sebo