Here you are:
http://depositfiles.com/files/ixp3badeaIf you would launch main.c, everything must work fine: items (ball, capsule and so on) must collide with blocks and models.
Now, open map10.c and comment any line with "wait(3);".. then launch main.c again and you would get crash.
I cant find another explanation, except of "DLL didnt had enough time to load"