Comment 4 for bug 1240308

some of these messages can also be encountered without running a Python extension.

- open default document, open Document Properties dialog
- note that default units = px
- note that Page Size = A4 (mm)
- switch to Page Size = US letter (in)
- switch to default units = mm
- get multiple console messages

** (inkscape.exe:2680): CRITICAL **: Gtk::TreeModel::iterator Inkscape::UI::Widget::PageSizer::find_paper_size(Inkscape::Util::Quantity, Inkscape::Util::Quantity) const: assertion `smallX <= largeX' failed

- switch to default units = pc
- get more console messages of the above type