CThe Problem here is that when the SUBMIT button is clicked, after being hidden and the displayed, it disappears when an error is thown, even though the condition for the display is TRUE.

So, Answer the two questions. Check if the Submit button is displaying

Then check the I AGREE checkbox. The submit button should display

Then click the submit button (do NOT fill out registration fields, we want to throw errors!!)

Notice that the submit button hides itsself even though the I AGREE checkbox is still checked.