It's kinda minor. But I though I report it anyway.
I played the Campaign today. Or to be more precise; I continued a Campaign I started a while ago.
During Mission Briefings Grand Master Belial isn't to be heared.
Only Text appears, but that doesn't continue on it's own as well.
I had to keep pushing "H" to further scrolling of the text.
Only the last sentence was once spoken out loud.