I tried to extend HandyNotes so that it would add extra icons to World Map. I downloaded a couple of other already made modules for HandyNotes. I decided to just slightly change HandyNotes_ToolsForTheTrade (link). I communicate with an author but he does not response.
Everything is almost good with one exception that my custom icons I decided to use are invisible / transparent. I have noticed the objects exist on the map because when I point over them I can see map responds correctly showing me tooltips with proper info etc. I can't understand why the icons are not shown.
I assume that path to the files is correct and points to an existing folder, e.g. `Interface\\Addons\\HandyNotes_ToolsOfTheTrade\\Icons\\orange_gem.tga`, the file format is correct, .TGA, and size is 32 pixels, with 1 alpha channel for transparency. I used the same files with another addon like core HandyNotes itself and they were displayed without problems. They don't seem to work with this module.