Sending webmap item numbers to a single map template

Discussion created by marylandgis on Jun 16, 2011
Latest reply on Jul 6, 2011 by marylandgis lets us send a webmap item number to display our map in one of Esri's Javascript map templates, like this:

But it fails when I try this with a local copy of the template like this:

[my local]/seaside/index.html?webmap=5d21f88afefe4845b3cdf8f334b7cbcd

It still shows the default map that comes with the template download.

Can anyone tell me how to make this work?