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Okay, supposedly this is a "feature" of the 90D. Flash can pop up in any mode.This was not the case with the 70D which allows the flash pop up button to be disabled and remappedfor a different function. That's progress.Thank you for the comments and ...

Thanks, that's been turned off since day one.

That's not an issue, I have a light.

Thanks, Canon is aware of it.

I did a camera reset. No change, flash still able to pop up in Movie Mode. Defect.