"Select THX Spatial Audio as your default playback device" even though it is - Razer Kraken TE

So my Synapse is currently looking like this, with all of the programs on my computer greyed out. Whenever I load a game, like Rainbow Six: Siege for example, the game usually appears at the top and allows me to change between "Stereo" and "Surround Sound". For some reason this doesn't happen anymore and I don't have the option to change new games as they just don't appear here. Scrolling down this list of programs is just another couple of programs I have on my computer but Rainbow Six: Siege is an example of a game that doesn't appear. It's something to do with the fact that it's telling me to make THX Spatial Audio as my default playback device in Windows, because this message doesn't appear on Synapse on my other PC and everything works fine ont there.

I obviously have it set as the default playback device exactly the same as I do on my other PC where it works fine, but for some reason Synapse doesn't recognise that I have it set as the default, which is what I think is causing programs not to appear in Synapse for me to tweak them (like Rainbow Six: Siege).

 

I have same issue with same headset...since yesterday reinstalled atleast 7 times as fresh installation and it work for hour or so and it happened again and again..i dont know what to do