Are you running win 7 in any variation? I've had win 7 64 bit resest sound options i.e.-some reboots system defaults to head phone for all audio.Even then some games-swtor for one will use speakers for audio or sometimes vice versa (using current ISboxer). I am not sure what causes the reboot variations-but all works well for a few reboots once manually changed on sound settings for windows. I do run System Mechanic in the background to fix errors and other problems and think their "definitions" may play a large part in this this-hasn't happened in a month or two.
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