I've got the musgo connection, and I've never installed Doom. Is it possible that someone was playing Doom on a nearby 770 when I was checking for connections, and I picked up the musgo from them?
Perhaps it's just a coincidence, but I installed the firmware update last night, and this morning was the first time I noticed musgo.
Are the preferred connections stored in a config file somewhere?
Open the Application Installer.
Select Doom in the list.
Click Uninstall.