I've just installed wordTube 2.4.0 and added the new JW Player 5.8 that I've found here: http://www.longtailvideo.com/.
Now I get the following errors:
1) Notice: Trying to get property of non-object in ....\wp-includes\post-template.php on line 30
2) Error #2044: Unhandled error:. text=Task Queue failed at step 5: Playlist could not be loaded: XML could not be parsed or playlist was empty
Ans is it a problem that the new version of JW Player doesn't offer the "yt.swf" file.