Hi there,
I can confirm I have been facing the same behaviour as you. Do not ask me why, I assume that objects within Chrome have to be treated differently but I might have good news for you, try to execute the following test. I have been able to hit the Submit button in Chrome.
Cheers
function Test2()
{
Browsers.Item(btChrome).Run(url);
var page = Sys.Browser().Page(url);
page.FindChildByXPath("//input[@type='text']").SetText("Tester");
page.FindChildByXPath("//input[@type='password']").SetText("test");
// Press the "Login" button using the native click() method
page.FindChildByXPath("//input[@type='submit']").NativeChromeObject.click();
}