We are sorry to hear that you're having an issue with FS Traffic. As always, the best place we can point you to for further support is Just Flight Support at the following link: https://www.justflight.com/support
Our support team will be best suited to provide further troubleshooting and assistance.
With regards to the actual traffic behaviour, such as the thrust reverser deployment, this is something that is entirely controlled by the simulator. FS Traffic generates and activates the traffic at the respective times, but the actual taxiing, takeoff, climb, cruise, approach, and landing are all controlled entirely by the core MSFS AI traffic engine. These same behaviours will affect all Ai traffic products that utilise the core MSFS Ai traffic engine. We have some areas of significant regression in the default Ai traffic behaviour in MSFS 2024 compared to the latest MSFS 2020 Sim Updates, so we can only hope that Ai traffic behaviour continues to be improved upon in future MSFS 2024 Sim Updates.
With regards to the "Application already running" message generated by the Traffic Control Centre, this is generated when another instance of the Traffic Control Centre app is already running. Any open instances of the Traffic Control Centre app will be shown either on the Windows Task Bar at the bottom of the screen, or in Task Manager listed as "trafficControlCentre.exe".
Mark - Just Flight