Just an update for others ...Just an update for others searching:
Veoh recently changed at least one of their servers (v-previews.veoh.com) so that if the referer contains *.swf*, and isn't coming from their domain, it will give:
HTTP/1.1 403 Forbidden
Date: Thu, 21 Jun 2007 08:36:52 GMT
Server: SWS
Connection: close
The solution is easy: rename flvplayer.swf to flvplayer.flash (or whatever you want, provided it doesn't contain "swf"), and it will play again :) Just make sure to change your html accordingly of course.