Lot of errors after upgrade to 1.7.7.1

[Bequitas]

Hi everyone,

I'm havig a lot of errors after upgrade to 1.7.7.1 version.

Some of them are showned in the images I'm sendig. One at CPanel, the is the error "400 Bad request", just when I try to login at Front End.

I also cannot search for translations (there is no text box at the top of page to place any word) and, at installed modules page, search doesn't work at all...

And... I cannot install any module, the page gets stuck totally.

I'm getting crazy. Thanks in advance.