For information: I just uninstalled MPC BE
Why?
It was not able to play: https://rrr.sz.xlcdn.com/?account=atvijf&file=live&type=live&service=wowza&protocol=ht...=playlist.m3u8
Error: no rendering possible
The same IPTV stream plays without any problem with: vlc, MPC HC and mPlayer (Kodi).
Probably a lacking codec. I use now one of the alternatives.