It seems the process SwiService.exe on Windows computer prevents me to use MC7455 with a GNSS simulator. So probably it sends A-GNSS information to the receiver, or something like that. Once I killed the process, I was able to run some scenarios successfully.
But still, how to reset the GNSS receiver so that it does not “remember” the last GPS week, remains a mystery to me.
It would be so nice if one wouldn’t need to waste time with this kind of things.