Hi, Test cl
I'm not quite sure what TestedApps.WebApp1.Run(); does in your script. Looks like it starts some application (or another instance of Chrome) which is recognized as overlapping window.
Try this script. Will it work?
function Test4()
{
  var browser;
  var page;
  var form;
  var textbox;
  Browsers.Item(btChrome).Run("http://support.smartbear.com/Samples/TestComplete10/WebOrders/Login.aspx");
  browser = Aliases.browser;  
  page = browser.pageSupportSmartbearComSamplesTe;
  form = page.formAspnetform;
  textbox = form.textboxMaincontentUsername;
  textbox.SetText("Tester");  
  form.passwordboxMaincontentPassword.SetText("test");
  form.submitbuttonLogin.ClickButton();
  page.Wait();
  page.formAspnetform.linkLogout.Click();
  page.Wait();
}
Regards, Artem