Tableview shifting after 1.8.2 update

iOS5 TI SDK 1.8.2

I have a tableview in a window. If I open that window, the tableview appears as it should. BUT if I close that window and open it again later, the tableview quickly shifts up to it's position. This isn't app-killing, but it definitely isn't visually appealing. Am I doing something wrong or is this a bug? Demo code below...

//create main window
var window1 = Titanium.UI.createWindow({ navBarHidden:true,tabBarHidden:true });
 
//create and add button to open window 2
var btn = Ti.UI.createButton({height:100,width:100});
window1.add(btn);
 
//create window 2 for tableview
var window2 = Titanium.UI.createWindow({ navBarHidden:true,tabBarHidden:true });
 
//create back button to go back to main menu
var backBtn = Titanium.UI.createButton({height:30,width:50,top:10,left:10});
 
//create search bar
var search = Titanium.UI.createSearchBar({
showCancel:false
});
 
//create data for tableview
var theData = [
    { title:"One", hasChild:true },
    { title:"Two", hasChild:true },
    { title:"Three", hasChild:true },
    { title:"Four", hasChild:true },
    { title:"Five", hasChild:true }
];
 
//create tableview
var menu = Ti.UI.createTableView({
height:405,
top:55,
data:theData,
search:search
});
 
//add menu and back button to window 2
window2.add(menu);
window2.add(backBtn);
 
//Set up the Tab Group
var tabGroup = Titanium.UI.createTabGroup();
var tab1 = Titanium.UI.createTab({
title:'window1',
window: window1
});
 
//Add and open tabgroup
tabGroup.addTab(tab1);
tabGroup.open();
 
//button click events
btn.addEventListener('click',function(){tab1.open(window2);})
backBtn.addEventListener('click',function(){tab1.close(window2);})