Error on Search Page

When I hit any button on the search results page i get an:

Code: Select all

{
    "components": [],
    "htmlContent": "",
    "status": 1,
    "message": "O formulário apresentado não era válido. Tente enviar novamente."
}

EDIT: for some reason "check_form_key('quick_mod_form')" is false...

@Canidev, could you please take a look at this?