Uploader.UploadType ="Flash"-->authentication box pop up and then it freezes

Uploader.UploadType ="Auto"--> browser freesez after upload is complete

Uploader.UploadType ="SilverLight"--> works fine no problems there, no authentication box appears and no browser freezes up

Uploader.UploadType="Iframe"--> works fine but only one file can be selected

 

Thanks