when add a video to playlist by url, it says ""invalid request" ?

Can't add video to my playlist by adding video url, it says "! invalid request" .

Here is a temporary fix:

Open the video in its independent page, between the "thumbs down" and the "share" button, there is the "Add to" feature.
Here you can click "add to", in the drop down menu, you can add to the playlist you want it to be.

For me (360 or IE browser):
this "invalid request" thing only happens to the case when adding a video, nothing wrong when delete a video or add a playlist.

Another nice fix " change to Firefix browser" , everything works well :)


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Ignore tags:
"add a video to playlist" "youtube feature" "add video by url"
youtube google forum:
http://www.google.com/support/forum/p/youtube?hl=en