Quick fix for a small problem that has come up recently for me. I am not sure if it was flash play 10.1 or the most recent Quicktags update, regardless if you are seeing the flash player throw a property cannot be set error on a "_wmode" variable the fix it fairly simple.
Edit the "vipers-video-quicktags.php" and comment out line #3675, it
should look like this after your done
//$embed['flashvars'] = array_merge( array( 'wmode' => 'opaque', 'allowfullscreen' => 'true', 'allowscriptaccess' => 'always' ), $embed['flashvars'] );
it seems these variables are being sent into the flashvars instead of the SWFobject params, commenting this out seems to have no side effects I has seen thus far.
hope this helps