Unable to use push to talk

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I used to be able to use push to talk just fine but since two days ago it started doing this. http://ift.tt/1WPW7JQ Even though I select it and press apply it just goes back to voice detection. I am running on TS3 Version 3.0.18.2 The headset I use is an Astro A50 headset. Running... Unable to use push to talk