Someone's recent change (likely the repr changes by swingincelt) broke
preferences loading and saving. Now upon exit, a new <inkscape>
element with all its children is nested at the end of the
~/.inkscape/preferences.xml instead of replacing the existing
<inkscape>. Thus the size of the file grows by 13K on each run of the
program, and any changes you make to the prefs are not read next time
you run. Please fix ASAP.