I manually placed a tmx map and bitmap in my scenes directory, made a node and put it in, and it sorta works. I can't see the map in editor, but when I play it, I can see it.
This is what I did, in the editor, create a new 2d C# project.
unzip tmxstuff, and place the 3 files into the Scenes directory of the new project (overwrite the Scene.scene file). This will skip the step where you drag in the tmx map into the project.
Then you should be able to play the project and see the map.
And you can disable (or remove) the current tmx map node, and try your map again and see if you get the same results.
tmxstuff.zip (106.7 KB)