PoE in fullscreen mode causes other programs to crash

Prior to 3.6, I was paying with dx9Ex, specifically because dx11 had been buggy when I tried it.

Since 3.6, I'm forced to play with dx11 and encounter a severe problem/bug: whenever I start PoE 3.6 in proper fullscreen mode, or alt-tab back into it after having alt-tabbed out before, my VLC media player and sometimes also my Winamp mp3 player crash. This behavior is 100% consistent/reproducible.

When I'm using PoE in windowed mode, or in windowed-fullscreen, these crashes don't occur. However, windowed-fullscreen is constantly running at full cpu load, even when I alt-tab out of the game. Since I'm playing on a laptop, this is not feasible; I want to give my machine some minutes without load to cool down from time to time.

Does anyone else experience the same issue, or have an idea what could be causing this?
In dx9Ex, which I was using prior to 3.6, the proper fullscreen mode didnt have such an issue and everything was running fine...

Am I really the only one with this problem?