Long reports problem ....last pages are empty ??

Hello all
I use delphi 5 + Qr3.08 Pro.
I have problems on different computers and it goes like this:
When the user print a 40 pages report only 30 will print
ok the rest 10 will print Empty (only the bottem frane lines
are printed).
in some computers it happend after 30 paegs and in another aftre 12 pages.
I suspect a memory lake ,but cant solve it
any ideas ??