swfu is undefined when i upload media

Hello….

I have a bug when i want upload a media…

A choose an image, and press upload. when the upload is done, i have white screen and i can’t edit info of media.

In firebug i have :

swfu is indefined

switchUploader(1) load-scr…9e2f304d2 (ligne 166)

swfuploadPreLoad() load-scr…9e2f304d2 (ligne 166)

anonymous() load-scr…9e2f304d2 (ligne 158)

anonymous() load-scr…9e2f304d2 (ligne 158)

I don’t understand..

Thank you all :x