Well, I am using Microsoft's Defender, no third party anti-virus software.
I disabled realtime scanning, and gave it another try. Still CTD upon loading ac into sim.
I am running out of ideas here.
Maybe one consideration. The whole steamlibrary is put on a NAS that is bound to the PC through iSCSI (2,5Gb network). Do not know whether this is relevant. Timing issues?
Glad however that I can take up your plane into the XPlane 11 skies . I certainly enjoy it there
Anyways, a BIG thank you for looking into this
John