[TYPO3] BE not working after upgrade to 4.2

[Piotr Burda]

Hi

After upgrading (from 4.1.2) to 4.2.1, my backend looks strange when 
using List, screen:
http://www.narty.pl/em/screen_1.jpg

Second problem is more serious, when trying to edit content element 
(pencil icon) i have error HTTP 500 - screen is here:

http://www.narty.pl/em/screen_2.jpg

PHP 5.2.4
TYPO3 4.2.1

Whats wrong?