edit: This crashing only happens on one machine. I don't have time to debug, I'm already happy if I can muck about with a C compiler every now and then.

The "Program has encountered a problem and needs to close" is what happened. After my first try at using ALLEGRO_PATH. So I thought I did smthing wrong there. But I can't reproduce that anymore as after four days all files have gone.
It had Allegro5211 and MinGW5302 on it so yes it could be that. I know that

	al_destroy_event_queue(event_queue);
	al_destroy_timer(timer);
	printf("Fout!\n");al_destroy_display(display);

	al_rest(2.0);

	return 0;
}

I moved the printf further and further and "Fout!" still got printed in this case. So i don't think ALLEGRO_PATH has got to do with it.
(this is an Athlon X2 on a VIA chipset and cheapo ATI 9200 graphics, when I get my ATI 9600XT back this should become an OpenBSD desktop)

edit: I compiled after installing 5.0.10 and 4.7.1-tdm, but not the same code, it runs OK.