This is somthing I can try, but I don't think it will solve my problem. My reference never changes, it is always the same and is correctly registered with every new release. What does change are the number of methods and properties. With each new release there are usualy additional methods and properties; however, the old ones are still there with the same names (thank goodness). The problem this causes with LabVIEW, apparently, whenever there is a change in the type library you must re-point all the methods an properties again, at least this is what I am experiencing. If doing what you suggested works, it would be some kind of magic that I would like an explanation for.