Plugin Woocommerce 2.1.2

I have 2 problems.

1) Some how the backend of woocommerce got broken:

When a go into product:

The display to edit the product information is all messed up in one long page intead of multiple tabs. Also I can`t delete or add gallery photos.

Here is a screenshot: https://oficina.com.py/wp-content/uploads/2014/02/problem.png

2) After check out, there are errors, so it redirects to the cart (and erases the cart) instead of redirecting to the thank you page.

I know where to look for the fix but my knowledge is not enough

I get the information even after the wrong redirect after errors, so I just need to redirect to a page that says thank you, but I cant even do that with this code:

// Redirect to success/confirmation/payment page
					if ( $result['result'] == 'success' ) {

						$result = apply_filters( 'woocommerce_payment_successful_result', $result, $order_id );

						if ( is_ajax() ) {
							echo '<!--WC_START-->' . json_encode( $result ) . '<!--WC_END-->';
							exit;
						} else {
							wp_redirect( $result['redirect'] );
							exit;
						}

					}

				} else {

					if ( empty( $order ) )
						$order = new WC_Order( $order_id );

					// No payment was required for order
					$order->payment_complete();

					// Empty the Cart
					WC()->cart->empty_cart();

					// Get redirect
					$return_url = $order->get_checkout_order_received_url();

					// Redirect to success/confirmation/payment page
					if ( is_ajax() ) {
						echo '<!--WC_START-->' . json_encode(
							array(
								'result' 	=> 'success',
								'redirect'  => apply_filters( 'woocommerce_checkout_no_payment_needed_redirect', $return_url, $order )
							)
						) . '<!--WC_END-->';
						exit;
					} else {
						wp_safe_redirect(
							apply_filters( 'woocommerce_checkout_no_payment_needed_redirect', $return_url, $order )
						);
						exit;
					}

				}

			} catch ( Exception $e ) {

				if ( ! empty( $e ) )
					wc_add_notice( $e->getMessage(), 'error' );

			}

		} // endif

		// If we reached this point then there were errors
		if ( is_ajax() ) {

			ob_start();
			wc_print_notices();
			$messages = ob_get_clean();

			echo '<!--WC_START-->' . json_encode(
				array(
					'result'	=> 'failure',
					'messages' 	=> $messages,
					'refresh' 	=> isset( WC()->session->refresh_totals ) ? 'true' : 'false',
					'reload'    => isset( WC()->session->reload_checkout ) ? 'true' : 'false'
				)
			) . '<!--WC_END-->';

			unset( WC()->session->refresh_totals, WC()->session->reload_checkout );
			exit;
		}
	}

Someone knows how to redirect this code to a single page when the result has error (failure)?