You probably opened the html-file directly from the local filesystem without using a Web-server.
Playing back flv-movies only works if the Movie is opened through a Web-Server because the Flash-Player of Macromedia only supports FLV-Playback through HTTP (or their streaming server) but not through local file access.
(I think they should have done it differently, though, and also support FLV-playback from local file access...)
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A comparison of screencasting apps for Linux (including DemoRecorder)
(first published in Linux Format Magazine, issue July 2009.)
Interview on the Linux Link Tech Show. Please select Episode 154.
DemoRecorder featured in Linux-User Magazine (in German)
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BTW, the website DemoRecorder.com is hosted on Neue Medien Münnich ( all-inkl.com ) in Europe.
The US download mirror ist hosted on Host Gator .