Selecting printer from apps core dumps. Howto debug?

[Graham Bentley]

Hi FreeBSD'ers !

I have now a nice desktop setup with Xfce4 etc
thanks to all help from the list (what a great 
place to be:)

I have cups setup with a ppd to print to my usb 
HP Busines Inkjet 1200.

It works perfectly from doing the printer test
page from the cups webmin:631 page.

In applications, if I select this printer, the 
app core dumps.

Apps effected are Abiword, the printer admin
xfprint4 in xfce4 and a few others.

Who would I go about trying to diagnose this?

Any help appreciated :)