When installing Vanilla 2.0 - dbhost does not get set

Even if I enter "localhost" in the install, it does not seem to get set .. on the next page I get this error:



56: $this->_Connection = new PDO(strtolower($this->Engine) . ':' . $this->Dsn, $this->User, $this->Password, $this->ConnectionOptions);

57: if($this->ConnectionOptions[1002])

58: $this->Query($this->ConnectionOptions[1002]);

59: } catch (Exception $ex) {

60: trigger_error(ErrorMessage('An error occurred while attempting to connect to the database', $this->ClassName, 'Connection', $ex->getMessage()), E_USER_ERROR);

61: }

62: }

63:

64: return $this->_Connection;