"Ghost Update - When you log in, the application says it's been "updated" but none of the fields have changed. Once you log out and log back in, the application returns to being "submitted". Ghost updates are not announced by email and a candidate must check their profile daily to not miss them. "What is ghost update?
"No one really knows exactly what a ghost update is but some people speculate that it could mean that there is a visa officer working on your profile and he updated something that isn't visible to you, others say it is just a system glitch. Personally, I think it could be both, sometimes the system does glitch and sometimes people get a reply within a couple of hours/days from a ghost update."