It sounds like that's a feature included by the author of the addin.
Maybe you could find that person and ask him/her to turn it off.
(What was the addin's name?)
Microsoft NewsGroups wrote:
Upon setting an add-in to true, a message displays confirming the add-in was
loaded. Even if I set Application.DisplayAlerts = False, I get the message.
Does anyone know of a way to suppress it?
Ryk
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Dave Peterson