It appears to be the combination of the two AI aircrafts package that create the CTD- selecting either FSLTL or AIG only works perfectly, but the default PSXT setting with both create the CTD.
I unselected some liveries input by selecting only FSLTL as source in the PSXT menue- and now MSFS2020 stays OK. So the problem might come from AIG liveries, but how and why I dont know.
Having parked A320 at a gate EKCH fully established and after that starting up PSXT the MSFS crashes to desktop. Probably some setting in PSXT is wrong, but which one can have such impact on the performance?