normcdn on "redirect deleted album not working"

Hi,
I am used to redirect file from my server.
But there is something I do nmot understand about ZenPhoto.
In my GWT, there is 404 error message.
Yes this album no longer exist, but I cannot redirect to the proper album.

Here is the code I am using ...

RewriteEngine on
RewriteRule ^gallery/Sights/RestoLasDunas/$ "http://www.cayocococuba.net/gallery/Sights/RestoLarga/" [R=301,L]

Usually it works, but not this time.
Any clue?
Thanks