For Xara team:

The bug reported here

http://www.talkgraphics.com/showthread.php?t=32206http://

has been fixed some time ago by the download version patch. However, the bug is still present in the CD version and its latest 4.0.1 patch.
The behavior is slightly different from the original bug, but the problem remains: when using bleed of more than 0.3cm, some printer's marks elements are missing in the exported pdf, with marks totally missing in a pdf file exported from a document using 1cm bleed.