Natural Studio V 6.1.1. PI 14 - using COM/OLE to access Word

We are converting this application (creating Word Documents with merge data from Natural) from DDE to COM/OLE and suddenly SENDKEYS - by which we send ‘re-entry’ keys back to Natural when Word closes - is only intermittently working - I can debug both sides (Visualbasic Template and Natural) and all the evidence is that occasionally the SendKeys value is active (ie the equivalent of a Function key) and other times not, under no apparently different circumstances.

Does anybody have a similar application running via COM/Ole ?