Possible delay timing issue? - Roku2

I've noticed this a few times on various channel projects I've been working on.
For the roKeyboard Screen and roPinEntryDialog screen, when I call the screen and return the value to the calling function, if I don't print the returned value it sometimes fails the immediate check on the next line of code.

Function CaptureEmail() As String
	screen=CreateObject("roKeyboardScreen")
	port=CreateObject("roMessagePort")
	screen.SetMessagePort(port)
	screen.SetDisplayText("Enter your email address")
	screen.SetMaxLength(100)
	Screen.AddButton(1,"Done")
	Screen.AddButton(2,"Back")
	Screen.Show()
	While TRUE
		msg=Wait(0,port)
		If Type(msg)="roKeyboardScreenEvent"
			If msg.isButtonPressed()
				Print"Button pressed: ";msg.GetIndex()
				If msg.GetIndex()=1
					entry=screen.GetText()
					entry=entry.trim()
					If len(entry)>0
						Return lcase(entry)
					End If
				Else If msg.GetIndex()=2
					Return "invalid"
				End If
			End If
		End If
	End While
End Function

		email=CaptureEmail()
		print email
		If email<>"invalid"

Sample code --

Function CaptureCode() As String
	screen=CreateObject("roPinEntryDialog")
	port=CreateObject("roMessagePort")
	screen.SetMessagePort(port)
	screen.SetNumPinEntryFields(5)
	screen.SetTitle("Enter Code")
	Screen.AddButton(1,"Done")
	Screen.AddButton(2,"Back")
	Screen.Show()
	While TRUE
		msg=Wait(0,port)
		If Type(msg)="roPinEntryDialogEvent"
			If msg.isButtonPressed()
				Print"Button pressed: ";msg.GetIndex()
				If msg.GetIndex()=1
					If len(screen.Pin())>0
						Return screen.Pin()
					End If
				Else If msg.GetIndex()=2
					Return "invalid"
				End If
			End If
		End If
	End While
End Function

The calling function has this

code=CaptureCode()
	print code
	If code<>"invalid"

Sometimes it works without printing the code, sometimes it fails without printing the code. By printing the code every time it appears to operate correctly.
I'm confused why it would do this, and printing it takes care of the issue, so I just thought it'd be good to report it here. Without printing the email after email=CaptureEmail() it just sits there when it is returned.