Tobax wrote on Apr 4^th, 2016 at 5:32am:

I have the CS757 working quite well in P3Dv3. Same old bugs with the FMC and the flight model. I did have an odd issue with TCAS until I found that the Avatar Mode in P3D causes an issue with it. To resolve I disabled Avatar Mode and restarted P3D then the traffic alarms went away and the TCAS worked properly. I think you could enable Avatar Mode after you startup P3D and it won't conflict with the CS TCAS gauge. That's how I discovered the cause of the issue anyway.

I am loving his solution. I've been suffering with the TCAS problem for months.....and now I finally have a solution!  Thank you thank you!  So long avatar man......and hello CS757!