In a similar vein to #351145: After upgrade, blip.tv videos show: Error: Invalid Feed when I now upgrade a site from Drupal 5 to Drupal 6 and view a node with a blip.tv video, the URL is http://blip.tv/play/ If I edit the page and submit, then the URL comes out correct. The solution given in http://drupal.org/node/351145#comment-1612232 of

You can also reload data manually by going to /admin/content/node, filtering by your video types, and using a node batch operation for 'Reload embedded media data.'

indeed works but if the site has more than one page on /admin/content/node then this solution can be a bit tedious. I suppose http://drupal.org/project/views_bulk_operations would probably work, but perhaps a built-in solution would be better?