Excel VBA macro workbook startup - security warning - automatic update of links disabled <p>I've created an add-in and installed it, but now when I open Excel I get an error pop-up telling me that the add-in file is a security risk and that automatic updating of links is disabled. I've looked it up and it refers to the Windows DDE protocol, but what does that have to do with this add-in? Does anyone know what's happening behind the scenes here?</p> <p>Thanks</p>