I've noticed all sorts of explosion sounds aren't playing. Funnily, the sounds work in the first mission I load, but not in any subsequent scenario I load.
I've uploaded a track, but I'm not sure that anything can be learned from it.
System specs:
i7 4770k
2x GTX 970 4GB SLI
16GB RAM
Sound Blaster Z PCIe internal sound card No explosion sounds.trk