[TYPO3] funny problems with T4.2

[Costa Papadopoulo]

Hi all,
sorry, but I forgot to mention, that when I save things in BE, it always 
gives me the message:
"Your login has probably expired.
Do you want to refresh it now?"

Why ? I did not log out.

When I click "ok" it logs me out, when I click the button on the right 
everythings ok and I can save.

I really wonder... I never had such trouble with typo3.

costa