since last week I can not update the Flex SDK soruces any longer because SVN update requires authorization.
Authentication realm: <http://opensource.adobe.com:80> Opensource Subversion Repository
The problem is that http://opensource.adobe.com/svn/opensource/ requires authorization. Is there any workaround to this issue or can we expect this to be fixed soon?
Try deleting your local repository and downloading (checkouting) it again...