Yes, I see the flash on the "general" page. The other (the default demo) I don't see a flash, but I can browse to and insert a video from your collection of stock ones, and it plays. A glance at the source code for the page shows the default reference,

/uploads/kick_baby_2.mpeg

My page with the editor instance is in a different subdirectory off of the root than the upload directory - is that the problem? There is method to that madness, (I have two subdirectories referencing the user's upload area), but in any case, I'm too committed to changing that now...