I've been having some problems with the captcha verification codes on a lot of these pages.  I have my browser set to show a medium sized text and often that is too little to distinguish some of those squiggle and wiggles in those verification boxes.

I've found that I can hold down the control key and then scroll my mouse wheel out or in to resize my browser.  Holding control and rolling the wheel out zooms out to a larger size and rolling with wheel back to me zooms my browser back to it's regular size.