I reallized that something (T-junction heuristic) I thought it was the home of the bug was a false assumption. The bug was in the customized (will be replaced by lib2geom) printing function. Moving on, I initiated a poll on my blog about a matter that will impact any user of this (libdepixelize) project, with its accompanying information: http://vinipsmaker.wordpress.com/2013/08/20/should-i-really-target-kopf-lischinski/
I'll sleep a bit and back to coding when I wake up. See ya.