When this message comes up why don't you just select
and then also uncheck "Always show this message"
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Because it resets everytime you restart inventor. And if you have ever used inventor for more than a day, you know that this can be multiple times per day.
No, there's no way to turn it off. I've been fighting a war against Inventor's worthless dialogs for a while. You're welcome to join me: http://forums.autodesk.com/t5/Inventor-IdeaStation/Edits-to-the-flat-pattern/idi-p/3840914