The first answer is not fixable, I also use a brilliant addon GSXpro which is updated nearly weekly. The answer I got was I'm using up too much memory running both, And FStraffic is a standalone product not built to be used with othr add-ons.
But this never explains how I can go and restart and then traffic appears along with GSX running
All I want explained there is why a restart fixes it.
I'm not using any data, just adding in GA aircrat to airports that are not in your system such as EGMJ, Instead of blank airports I now have GA aircraft moving around
I'm doing it all through the FStraffic schedules and aircraft menus. It might not be perfect but it works. If I wnted to be more realistic I could have copied data from flightaware
First I downloaded the FSLTL fleet into my community folder.
I then went to selected aircraft folder and used aircraft 100 (all my GA aircraft are aircraft 100)
Then I went to the Aircraft menu and started adding in the FSLTL GA fleet
ie I picked the FSLTL_GA_C152_ZZZ just copy and past exactly from the C152 model title
ie another one is the FSLTL_GA_C172_ZZZ
Next EGMJ is not in your schedules so you need to add new airport,
Easy to find details for it, just use wiki, cordinates etc all there.
Once added I went into the Schedules menu and started pumping them in, I did it at 30 mins intervals
Lastly your other post ) "I find myself spending more time in the Traffic Control Centre than actually flying" - We are surprised that you find this neccessary. Most users only open it to look up where things are likely to be and when)
I think you will find MOST users do spend most of their time manually adding schedules because lack of product details . A good example EGNH Blackpool, NOTHING. So your customers need to spend their time fixing in th blanks
And what I would like to see in updates. A menu to modify Arrivals,