Hi,

 

We have found that is relative to Flash .

 

Only IE+Flash10 can support windows authorization

 

(Flash10 can read the existing authorization information from IE, without prompt the username/password again)

 

We also improve the Uploader for this problem.

 

So now you can have these solutions:

 

1. tell all users use IE+Flash10

 

2. tell all users use Silverlight

 

3. use code to disable the Flash and use Silverlight/IFrame mode automatically

 Uploader.SetAdvancedOption(UploaderAdvancedOption.NoFlash,"true");

 

Regards,

Terry