Lowered a Form's Target Version to 9.0 or later and now validation messages are appearing, even when Show Dialog Messages is set to "Don't show any message boxes at all"

Hi all:

I switched a form's target version from "10.0 and higher" to "9.0 and higher" and now I'm getting Adobe's automatic validation messages popping up, even when the Form Validation setting for the document is set to "Don't show any message boxes at all."

Any thoughts?  I have other form's set to 9.0 and higher and the same Form Validation setting of "Don't show any message boxes at all" works.

Only thing I can think of is the downgrading from 10.0 to 9.0 and higher did something?

Thanks in advance,

Brian