confirmed with:
Mac OS X 10.5.7 (9J61) XQuartz 2.3.3.2 (xorg-server 1.4.2-apple42) Inkscape 0.47pre1 r21720, built Jul 6 2009 no macports installs
reproduced with steps outlined in comment 4 console messages attached.
do you need the crash report as well?
confirmed with:
Mac OS X 10.5.7 (9J61)
XQuartz 2.3.3.2 (xorg-server 1.4.2-apple42)
Inkscape 0.47pre1 r21720, built Jul 6 2009
no macports installs
reproduced with steps outlined in comment 4
console messages attached.
do you need the crash report as well?