(sorry to reply to such an old message, but the info might be useful,
so...)

- James A. Treacy arranged a host of electrons thusly: -
> Is there a way to find out why an area is not being rendered?

Not that I know of, but there's a way (tile by tile, unfortunately) to
ask it to rerender.

> I did some updates to the Owen Sound, ON area a few weeks ago and it
> still hasn't been re-rendered (Hwy 6 looks awful on the map (*)). I have
> checked the area using the validator and everything seems fine; the
> validator gives a warning about the coastline having unclosed ways and
> I am not sure if that is something that could cause problems.

http://wiki.openstreetmap.org/wiki/Slippy_Map#Mapnik_tile_rendering
describes a method by which you can check to see when a tile (at a given
zoom level) was last rendered, and ask for it to be re-rendered.  If a
large area needs to be done, it would have to be done by a script.  I
had an area that didn't re-render after a week, and I couldn't figure it
out.  That time, I changed a few nodes, and the system seemed to notice,
and re-did the whole area.  YMMV on both methods.

> I have tried adjusting some nodes a few times since then but still
> nothing. Any ideas on why it isn't being rendered, or how to force a
> render?
> 
> (*) 
> http://www.openstreetmap.org/?lat=44.5728&lon=-80.9636&zoom=13&layers=B000FTF

Seems that things fixed themselves in the time it took me to get around
to replying (excellent).  But hopefully this info is useful to someone.

peace,
        Austin.

-- 
Build a man fire, he'll be warm for a day. 
Set a man on fire, he'll be warm for the rest of his life.

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