I am working on a  map-based application in which data tied to certain
physical locations is represented as a vertical, color-coded polyline
(think of a bar from a bar graph). there are around 2000 of these,
mostly very small, each an encoded polyline that is drawn from a
static file, which is then generated at some time in the past from the
database. it doesn't seem to make a difference in the behaviour i'm
seeing whether that information is retrieved via ajax or embedded in
the html.

i've seen a variety of inconsistent behaviour, including lines being
drawn on the part of the map that i can see, and then when i zoom out
none of the rest of the map has any of the lines that should be there.
what i am seeing most consistently, though, is that zoomed far out
where i can see the whole world map, all of the lines appear, and as i
zoom in on the US, which should be densely populated with polylines,
they begin to disappear from north to south -- the further in i zoom,
the more lines i lose across the northern hemisphere. once this
happens, the lines don't seem to come back when i zoom back out
again.

all of the points in all of the lines are set to the same zoom level,
with zoomFactor set to 16 and numLevels set to 4.

for a variety of reasons i can't get a live demo of this up to share,
but i'd really like to hear any ideas or similar experiences. i'm also
happy to send the files via email to anyone interested.

thanks!
violet, developer, macrosystems

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