Comment 24 for bug 466567

> so this bug happens in two cases: using .svg-icon themes on gnome
> or using anything on kde!

I apologize for the mess. The issues on GNOME and on KDE are unrelated IMHO.

To finish with the issue on GNOME in this bug, I suggest the following per-user
workaround for the Humanity icon theme:

#!/bin/bash

ISOURCE=/usr/share/icons/
ITHEME=Humanity

for size in 16 22 24 32 48;
do
  mkdir -p $HOME/.icons/$ITHEME/mimes/$size;
  for file in $ISOURCE/$ITHEME/mimes/$size/*.svg;
    do ln -s $file $HOME/.icons/$ITHEME/mimes/$size/`basename $file`.png;
  done;
done;

It turns out to be, that it is not required to convert SVG icons to PNG format:
changing the filename extension to .png is sufficient.