Comment 4 for bug 167449

1. You should not have used flowed text - you don't need it
here. And if you used it, you had to convert it to text
before viewing in other SVG viewers. More information is here:

http://wiki.inkscape.org/wiki/index.php/FAQ#What_about_flowed_text.3F

This takes care of the missing labels and black rects.

2. The only real problem in Inkscape is the wrong direction
of arrows. This is caused by the very strange way you
created the axes - instead of straight lines, they are
curves with both Bezier handles coincident with one of the
nodes. In this special case, Inkscape orients the arrows
wrongly (upwards), and other SVG renderers get it correct
(to the right). This needs to be fixed. For your particular
file, all you need to do is select both nodes on the axis
(in Node tool) and press "Make selected segments lines" button.