This URL in Firefox has what looks to have a somewhat larger white space to the left and right of it. The movie is 1280 x 720 and created in FCP HD. Looks fine in Safari and QT player. "Space" shows up with play button in DW and visible in FF preview, but not Safari. Can't reopen the FCP file because it's suddenly too "new" for the application (??????). So, I can't check double check the output settings. Don't think that's the problem anyway.
I've checked and re-checked the width in DW and done nothing exotic with the padding et al. I don't know what else to do. Any thoughts would be appreciated!