When opening a .cbz archive that contains images with the word "Página" in it, Comix doesn't display the thumbnails in the left pane and is unable to edit the archive. Displaying the pages works fine, though.
I guess it has to do with unicode filenames (the "á" character) as renaming the pictures and recreating the .cbz archive works.
BTW, is the development still active ? The last version of comix is more than one year old (after frequent updates at that time) and there are a lot of old bugs that doesn't seem to be worked on. Don't take it as a critic, I'm just wondering. ;)