Walt, thank you so much for your kind reply and sorry for misunderstanding, lets go through the steps to make it clear:
run the program -> you start with the photo persona
create a new file, e.g. 6000x4000 px (file -new)
select a raw file to place (file-place) and open it
select a different raw file to place (file-place) and open it
This was the moment the program crashed immediately, I didn´t do much.
But now I´m confused, just tried these steps once again, today it´s working fine
Second scenario:
run the program -> you start with the photo persona
select file - open and chose a raw file to open, thats it, the program closed, this works now as well, don´t know why, I didn´t change anything
never experienced a behaviour like this, and in addition, as mentioned above, both scenarios are working today, that´s weird
I will have to watch this, if any other errors occur I will write again.
Thank you and best regards, Dan