First let me say how I appreciate your prompt answer.
Your versions 1.51 crashes on all my PDF. I have first tried with the one attached which is admitedly quite heavy (231 pages plus diagrams). But then I tried on a cropped (bliss) version and a simpler 10 pages PDF with the same result. I am not geek enough to do anything else than press Enter and did not do any tailoring.
I think you will be disappointed with the screenshot inasmuch as the crash is very quick, quicker than my screenshot.
Strangely all starts with error message, but whereas in v 1.35 the soft moves on, in v 1.51 I got the windows message.
Thanks for your help.