When we upgraded to SAM v6.0.0 we began seeing the following error in OrionWeb.log:
2013-12-02 04:42:38,094 [9] ERROR SolarWinds.Orion.Web.AuthorizationManager - Get Auth Groups of admin.solarwinds in <AD-DOMAIN>. System.DirectoryServices.AccountManagement.PrincipalOperationException: While trying to retrieve the authorization groups, an error (5) occurred.
This error appears to be causing svchost to use 90-98% of CPU.