problem with notification area

[crustyourmind]

Hi
I've lost my noticification icon of claw mail in the notification area
(the claw mail module notification is so well added, but do nothing)
It 's alway run fine since but since few days the claw mail icon does not appear

http://cbiot.fr/img/icone-claws-mails.png
(http://cbiot.fr/img/icone-claws-mails.png)
(the icon envelope is this of xchat, before I've got 2 envelopes (xchat and claws mail)

I've have purge the application list of the area zone, but don't work. No problem with the icon of the theme

Any ideas ? No results in the french ubuntu forum.

Thx