MSExchange RBAC Event ID 265 error

Hi

I get the following error ever hour on a clean install of Exchange 2013 CU2 in a VM environment.

Any help appreciated.

Log Name:      Application
Source:        MSExchange RBAC
Date:          10/09/2013 7:27:01 a.m.
Event ID:      265
Task Category: RBAC
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      EXSERVER.DOMAIN.local
Description:
(Process w3wp.exe, PID 6804) "User  Org:  Cannot get the VanriantConfigurationSnapshot, Exception is thrown Microsoft.Exchange.Data.DataValidationException: The property can't be empty.
   at Microsoft.Exchange.Data.PropertyBag.set_Item(PropertyDefinition key, Object value)
   at Microsoft.Exchange.Data.Directory.ADPropertyBag.set_Item(PropertyDefinition key, Object value)
   at Microsoft.Exchange.Data.PropertyBag.UpdatePropertyDependents(ProviderPropertyDefinition propertyDefinition, Object value)
   at Microsoft.Exchange.Data.PropertyBag.set_Item(PropertyDefinition key, Object value)
   at Microsoft.Exchange.Data.Directory.ADPropertyBag.set_Item(PropertyDefinition key, Object value)
   at Microsoft.Exchange.Data.ConfigurableObject.set_Item(PropertyDefinition propertyDefinition, Object value)
   at Microsoft.Exchange.Configuration.CmdletFlight.GetSnapshot(ADRawEntry executingUser, IRecipientSession recipientSession)"

Regards
Brad