• Mapnik is not reredering a way / node if only an attribut is added / changed. Minimum on node has to be moved.
  • Under certain circumstances a rerendering occours automaticly, when the tile has been marked “out of date” (eg. a new object has been entered nearby).
  • Rerendering of the entire planet is done on occasion.
  • You can force Mapnik to render by adding “/dirty” to the URL of the image (eg. http://c.tile.openstreetmap.org/17/23996/43781.png/dirty))

btw: Referring to a specific object (node/way/relation) is easier by posting his ID or his related URL (eg http://www.openstreetmap.org/browse/way/50866332))