SAM 6.1 - Error while trying to retrieve the authorization groups

When we upgraded from SAM v6.0 to SAM v6.1 we are still seeing the following error in OrionWeb.log:

The following error message is appearing every 5 minutes in OrionWeb.log:

2014-03-26 11:13:02,819 [1] ERROR SolarWinds.Orion.Web.AuthorizationManager - Get Auth Groups of admin.solarwinds in XXXXX-PROD. System.DirectoryServices.AccountManagement.PrincipalOperationException: While trying to retrieve the authorization groups, an error (5) occurred.

   at System.DirectoryServices.AccountManagement.AuthZSet..ctor(Byte[] userSid, NetCred credentials, ContextOptions contextOptions, String flatUserAuthority, StoreCtx userStoreCtx, Object userCtxBase)

   at System.DirectoryServices.AccountManagement.ADStoreCtx.GetGroupsMemberOfAZ(Principal p)

   at System.DirectoryServices.AccountManagement.UserPrincipal.GetAuthorizationGroupsHelper()

   at SolarWinds.Orion.Web.AuthorizationManager.WindowsAuthorizationManager.GetPrincipalGroups(WindowsIdentity identity, String identName, PrincipalContext context, String domainName, Boolean& faulted)