hi, i had the same problem, i was so filled in fury!
but today i returned to try to export some .SVG,
and i watched the error window.. file "zlib-1.dll".
I said "Ok, let's check the program directory"
and to my surprise, i didn't find the so called zlib-1.dll,
so, i made a copy of zlib.dll and renamed it to zlib-1.dll,
opened sodipodi, selected all, export selection,
and voil!, the progress bar came to a full, and worked!
in brief: open sodipodi directory, make a copy of zlib.dll
and rename to zlib-1.dll
P.S.: i also had installed "libpng", downloaded from the GTK+
website, just in case, after reading some comments about it
here in the forum, and had the "libpng12.dll" copied from the libpng install direcory to the sodipodi directory.