confirmed with Inkscape 0.46+devel r22457 on OS X 10.5.8
console message: ** ERROR:display/nr-filter-units.cpp:43:void Inkscape::Filters::FilterUnits::set_resolution(double, double): assertion failed: (x_res > 0)
confirmed with Inkscape 0.46+devel r22457 on OS X 10.5.8
console message: nr-filter- units.cpp: 43:void Inkscape: :Filters: :FilterUnits: :set_resolution (double, double): assertion failed: (x_res > 0)
**
ERROR:display/