I just successfully installed and used logomaker on two Windows XP machines and wanted to post what worked and didn't work.
1) %MAGICK_HOME% pointing to "C:/Program Files/ImageMagick-6.7.0-8" wouldn't work, I'm assuming because of the space in the path. When typing "logomaker" in Allegro, I would get the instructions page instead of the logomaker utility opening. Placing potrace and imagemagick at "C:/utils/..." did work, though, after I reopened ProjMgr and Allegro.
2) Loading .jpg files into logomaker, I would recommend unchecking "Preprocess". I was inserting solid black FCC and Telec logos and using "preprocess" seemed to do an edge detect, whereas I wanted solid logos.
3) For some reason, once I place the symbols and exit the application, I can't move the symbols. I do a move command, with Find=Symbol, but when I click the final destination, the symbol snaps back to its original location.