If the property getter is not accessed before it is modified and it is not a value field then the OldValue will be null since the value is not loaded from the database, but the NewValue should not be null.
Can you send some sample code that shows the problem? This will help in resolving the issue sooner.
OpenAccess ORM is now Telerik Data Access
. For more information on the new names, please, check out the Telerik Product Map