Just to rule out a possible problem with your application. Try to use this flv. Another question: Dors Allok produce a single flv file that you are uploading?
Another possibility: There was a recent bug that was very similar to this situation that occurred with Articulate Presenter. The player would launch, but the flash content would not load. It turns out that the Articulate application used a method of flash detection that was no longer used in the latest flash plugin.
Resource types
flv files not playing
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