[scribus] I can't adjust print margins in 1.4

[josfon at xs4all.nl]

Hello

hello
I made a custom page (24x17 cm) in 1.4. with a bleed of 3 mm.
The printer installed is a pdf-printer.

The trouble is that I can't adjust the print margins (there are grey).
I want to adjust them to zero.
The resulting PDF should give the whole page without the bleed.
In the PDF-export dialog "Clip to Page Margins" the is checked.

The resulting PDF gives now a 3mm white margin aroun the page.
I never had this problem in 1.3.

greetings Jos Fontaine