My guestbook has been flooded with spam messages, 2 or 3 for every minute, for weeks in a row. There was no way to keep up with this by manually removing. The last entry dates from 3/4/2013, but I can't remove or add messages anymore (from the site and the admin section). Is there a size restriction which causes new messages not to appear? Is there a way to cleanup this mess instead of removing manually hundreds or even thousands of messages? Perhaps a 'Select all' can be added, with checkmarks to deselect those message's I'd like to keep?

As I understood in another post (http://answers.websitex5.com/post/58124#2) the improved captcha has been added to v9 as well, but it seems unusable right now in my situation as the guestbook is stuck.