I encountered the same behavior as the user above. Users do not see the liveblog updates and when logged in as an admin and posting liveblog updates... if I refresh the page those liveblog updates disappear. They do not appear to be actually getting saved.
Here are some screenshots illustrating what is happening...
I have created a new live blog entry on a post where i've enabled the liveblog plugin. See this screenshot:
I then refresh the page and my live entry disappears. While it appears to be published in the screenshot above... refreshing the page makes it go away, never to appear again. See this screenshot:
As for a non-logged in user browsing the page, they never even see the liveblog entry that I created and published. It never appeared, just like it disappears when I refresh the page as an admin after creating it.