That's a bit different than what you had asked in your first post, but thanks for clarifying.
I don't use the newest vBhome, so this may be a bit difficult for you to understand, but the easiest way to hide the latest threads for only members is to find in the vBhome index.php the whole section where the latest thread code lies, and place it inside an if-statement checking if the person is a member or not.
PHP Code:
if($bbuserinfo[userid] > 0){
[place latest thread PHP code here]
}
Go to your homepage now and check it out as a guest, then what I'm guessing you should see is a blank area where the latest threads usually shows.