I was hoping someone else would answer, as the PC I'm on doesn't have 2007 on it. I know there are differences between preview mode and the new report view or whatever it's called. For instance, in preview mode you can use the section format events to control formatting and such, but in report view those events do not fire (found that out the hard way). It would not surprise me if the timer event only fired when in report view. You might try opening it in that view and see if your message box fires then.
Microsoft Access MVP 2007-2019
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