After manually removing the 'inkscape:connector-type="polyline"' attribute from the lines with arrows, the drawing renders correctly in Inkscape 0.47 and 0.47+devel r9273 - both on initial view and after ungrouping the top-level group.
After manually removing the 'inkscape: connector- type="polyline" ' attribute from the lines with arrows, the drawing renders correctly in Inkscape 0.47 and 0.47+devel r9273 - both on initial view and after ungrouping the top-level group.