Somehow many of the in game sounds are not playing even though the sound is enabled within game settings and the interface makes sound when I use it. For example no sound plays when a unit fires it's weapon but if I open the menu the interface sounds play when hovering over options. To add to this, most of the time there is no background music but occasionally the battle music will play for a minute or two and then stop returning me to silence. I have no idea when this started as it's been a week or two since I last had the chance to play but I had full sound then. If it makes any difference I use headphones for my primary audio output and also have speakers plugged into the computer.
Game log against easy AI as a test- http://pastebin.com/HFMHYB8P
Forever log: http://pastebin.com/6Xb4sQPR
Thanks for any help you can give.