Hi,
I've been tracking an issue that prevents from printing certain paper sizes in GIMP.
It ended up being a bug in GTK+, fixed last December.
I've filed a bug on Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=480245
It would be nice to have an updated version of GTK+ for Fedora 9 and 10.
Thanks
Andrea