That's what it looks like ingame for me. I don't hear anyone nor does anyone hear me. I have tried configuring mumble, selecting my microphone and speakers etc but it didn't do anything. When I alt-tab I see the mumble icon in the bottom right just fine. When I click it it also tells me it has succesfully linked to PR: BF2. It's just that ingame it doesn't do anything and just shows me the red speaker icon on the bottom right.
