Webview problem with Alloy on iPad with SplitWindow

I've been having some problems with a WebView in my first Alloy application. Everything works fine on the iPhone (simulator and device). Its only on the iPad that I have a problem - the difference in the code being that I am using a SplitWindow for the iPad. The WebView appears to work ok in the iPad simulator but on the device itself it seems to run very slowly and always crashes after I have clicked on a few links. I have re-produced the problem in a basic app here. Am I doing something wrong? Could someone try and re-produce this on their iPad and see if they get the same issue? I am using the latest version of the Titanium SDK and compiling to the latest iOS SDK (6.1). My iPad is an iPad 3.

Index.js

$.index.open();

<Alloy>
    <SplitWindow id="index" showMasterInPortrait = "true" formFactor="tablet" platform="ios">
        <Require src="master"/>
        <Require src="detail"/>
   </SplitWindow>
</Alloy>

<Alloy>
    <Window>
    </Window>
</Alloy>

<Alloy>
    <Window title = "Detail">
            <Require src="webViewWin"/>
    </Window>
</Alloy>

<Alloy>
    <WebView url = "http://www.bbc.co.uk" id="webView"/>
</Alloy>

thanks

Richard