The key thing to do is clear the browser cache, that's where the coming soon page resides. Flushing DNS does only have affect if the domain doesn't properly resolve (which it definitely do when you get the coming soon page).
The reason it works in Internet explorer and not in chrome, is more then likely due to the coming soon page being cached in the chrome before the system had properly updated itself to know what content it expected to show on the domain, while you never opened it until after the system was indeed fully updated with the new domain and what content to show in IE.