I have developed the same mic problem. I've tried the ".resetv 1", ".resetv 2" and, ".resetv 3" but I've had no luck.
I have checked in the control panel to see that the mic is enabled and there is no mute. I have the volume at 100 and a +20 boost. I still use the "T" on my keyboard for squad vox and I use the "tab" button for country/range vox.
When I hit the transmit key everyone can here me key the button but no voice comes through. When you do the reset does it also remap the key? Should I have tried F12 for country/range?
I can see when I have the properties tab up for my mic in the control panel that when I talk in to it the volume levels move around so I think the mic is at least putting my voice in to the pc.