incidentlally, its alway very buggy…. Sometimes it doesnt work right away… I have to restart the game… etc.  Not smooth at all.

I had that issue as well.  What I did was unplug the Tartarus Pro, and replug  it in.

Synapse  is not a program with some ( or many) bugs, it is a bug with some programing.

I ended up going back to the significantly more stable Synapse 3.

Edit: Razer help were as much use as a teapot made from chocolate.  By the time they answered, I had found the unplu, and plug the USB back in solution.

greetings!   OK! I will try both of these things, and get back to you.  Thank you!!!!

YES!  So, I just unplugged it on plugged it back in, and it works for the moment….  THANK YOU!!!!

You are welcome.  It was just one of many issues I had with Synapse 4, before calling it a day and returning to the safety of Synapse 3.

Well my tartarus pro is going back … it simply does not work with synapse 4, keeps disconnecting.

Just tested synapse 3, but the win keys are not seen by the tartarus PRO.

Still have my v2, no problems there with s4, and it also works with Lwin key as extra modifier..

This is a must have for my flight sim DCS.