After making a change to an object within Manager for a column that has log changes enabled, right click on the column and select show property change history, the following error will be displayed
Unable to cast object of type 'QBM.AppServer.Interface.ObjectChange' to type 'VI.DB.History.ObjectChange'
This only happens when connecting to the AppServer instead of using the database for the connection in Manager.
This will be fixed on a future release of the product. If you require this immediately corrected, please contact support for a hotfix referencing the defect ID 29214