Thanks for the help.
Using the default scenarios gattispilot:
Atlantis to ISS, Atlantis Satellite Launch and Atlantis Launch into Sunrise.
Yes soumya-8974, it launches by itself straight away without thrust and falls back through launchpad mesh.
Orbiter 2016, D3D9.
On my mac it did it occasionally, but quitting Wine fixed it.
I just ran the Views/Moon through Atmosphere scenario and that ran fine and has reset things.
The default scenarios are running fine now. Hmmm
I'm not using attachment manager Donamy. Do you recommend?