My b2evolution Version: 3.3.1

:roll:
I am new here and I have upgraded my blog from 2.4.6 to 3.3.1, I get a notice when I log in in the backoffice.
Notice: Undefined property: Hit::$is_winIE in /myblog/public_html/skins_adm/_html_header.inc.php on line 225

This sentence appears on the top of every pages in backoffice.

this is line 225: if( $Hit->is_winIE )

when I tried to check the statistics (Hit summary, browers hits etc.)
I get this unexpected error: Unknown $name for AdminUI::get_template(): 'menu3'

I have tried to search on the forum, but nothing similar problems. For info I have IE8. I have check another computer with IE7 and gets the same "notice".

Do any body have an idea what is wrong? I dont think it is very serious, but it is boring