|Well the fix that is being worked on will not change the numbers, just the preview post checkbox issue.
For guessing the numbers I have 2 suggestions: If you "refresh" or "reload" the page you get a new security image, so you can pick an easy one. Also I'm finding it easier to get when I look from a little further away. Sorry for the inconveniences.
Another option we are looking into is a whole new forum system. Particularly vBulletin 4.0 Forum Classic. Have a look if you're interested http://www.vbulletin.com/