I have two potential audio outputs: my desktop speakers which run from the soundcard on the motherboard, and USB headphones. If I switch the playback device via the Sound dialog found in Control Panel while LR4 x64 is running, LR4 does not keep in sync with my choice. In order for my currently selected playback device to be recognized, I need to restart LR4. I am running Windows 7 x64 with 16 GB of RAM.
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