CorelDraw X4

trying to print a poster with several transparency bitmaps, Corel starts printing process, but the print job is not going to the printer, the print queue is empty and sometimes Corel crashes. The Corel file is 24 MB.

I tryed to export the poster as jpg and reimport to Corel: no succes. Photoshop prints the jpg without any problem.

What is the problem with Corel?