> How do I figure out why it is not working for me or any of my coworkers?

Doesn't work for me sometimes, in FF2.  In fact it seemed to work
first off but not on reloads - is that a clue about client side
caching?  Works when zoomed in tighter.  "not working" is apparent as
the mouse pointer failing to change when moved over 'clickable' areas.

> What factors could effect how the map and the click event loads?

The source KML is fetched from Google's servers and cached at Google ;
any issue with that should be consistent? Or would it ... the
processing of multiple files might include random who-goes-first
effects.

There it gets rendered into tile images the client fetches, and some
JSONy stuff that the client uses for managing clicks.  The images are
fetched at each zoom level, but I suspect the clicky stuff is one-
time.   How does Google manage this when multiple KML requests are
fired at it in series?  Is that what's going wrong?  We might imagine
the Google server starting to build the JSON for the fourth time when
once again another add-on KML request arrives ...

In Firebugs NET tab I can see an error 500 from
http://mt1.googleapis.com/mapslt/ft?hl=en-US&lyrs=kml%3AcFw2ptw
... &callback=_xdc_._l3edun&token=102928
and I'd guess that is the clicky stuff going wrong

Have a look at this thread for a technique to load multiple KML in a
serial controlled fashion
http://groups.google.com/group/google-maps-js-api-v3/browse_thread/thread/7cfdbd634a7cb456/aa3a8dee6bfaf02c
worth testing perhaps

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