I'm not sure this is the desired behavior, but when one selects the "Server Connection Info" menu item and presses the assigned talk button (mine is middle mouse button if that helps) no sound is transmitted. I suppose it's fine to lock the audio off when accessing the menus, but the perceived bug behavior happens when closing the "Server Connection Info" dialog. It appears that if you key your mic when the aforementioned dialog is open, the mic won't activate until you close the dialog box, one the dialog is closed the mic stays on until you key the mic again.