Greg,That is a real Doh! moment. Can't say why I never saw that event before. Interesting thing was that initially, it didn't solve the problem. When I did some digging I found that a childformdialog still had a legacy BOTranslation that wasn't in use but this was obviously corrupting the object creation.
At then end of it, issue now seems solved and many thanks for the input.
best
Geoff.