[TYPO3] reference index table problem

[Pete Novak]

Hi all,

I have a new 4.1.2 installation of TYPO3
but it always sais:
Important notice!

  a.. The Reference Index table is empty which is likely to be the case 
because you just upgraded your TYPO3 source. Please go to Tools>DB Check and 
update the reference index.
It is highly recommended that you change this immediately.

So when I go to db check, then iI click check now everything is ok.
Things are getting listed.
Then i click update

Then it seems everything was updated, but when i reload frame and have a 
look in table nothing was written.
Whats the prob, what do i miss?

thanks