IIRC the scale selector was new to 4.0.  I found this which might help:

http://stackoverflow.com/questions/3130420/how-to-call-uiscreen-mainscreen-scale-in-a-universal-app-for-the-iphone-and-i

mark

Mark Smith

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On Jun 16, 2011, at 5:14 PM, SmokeyBadger wrote:

> Got my game working fine on an iPhone 4... but now I'm having an issue when
> trying it on an older iPod Touch 2, running iOS 3.1.3.
> 
> I get the following exception/stacktrace... any help would be greatly
> appreciated :).
> 
> MonoTouch.Foundation.MonoTouchException as been thrown
> [UIScreen scale]: unrecognized selector set to instance ***
> at MonoTouch.UIKit.UIScreen.get_Scale()
> at Microsoft.Xna.Framework.GameWindow..ctor()
> at Microsoft.Xna.Frame.Game..ctor()
> at NinjaBoy.NinjaBoyGame..ctor()
> at NinjaBoy.Program.FinishedLaunching (MonoTouch.UIKit.UIApplication app)
> at MonoTouch.UIKit.UIApplication.Main (*** standard params ***)
> at NinjaBoy.Program.Main (system.String[] args)
> 
> --
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> http://monotouch.2284126.n4.nabble.com/exception-UIScreen-scale-tp3603911p3603911.html
> Sent from the MonoTouch mailing list archive at Nabble.com.
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