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As an administrator, on the Authentication page, select Mixed Authentication and make sure that all the available authentication types are in the column on the left. Save your changes and log out. When another user tries to log in to WorldServer after you have saved the changes, the WorldServer Internal Error page is displayed with "com.idiominc.ws.WSRuntimeException" in the details.
You can fix this issue by deploying the update to WorldServer 10.4.5, available on FTP.
If you cannot deploy it, contact the SDL Support Team: