I’m using the cformsII form plugin for WordPress. When debugging with firebug, I see that the following uri is not able to be navigated to (404 error):
.../wp-content/plugins/cforms/cforms-captcha.php?ts=2&c1=4&c2=5&ac=abcdefghijkmnpqrstuvwxyz23456789&i=i&w=115&h=25&c=000066&l=000066&f=font4.ttf&a1=-12&a2=12&f1=17&f2=19&b=1.gif
I have verified that wp-content (including subdirectories and files) has proper 777 permissions. Furthermore, I verified that I could navigate to 1.gif without issue. Finally, I verified that the GD library is installed as well.
It ended up being a problem with a corrupted captcha script. Was able to replace to correct the issue. Thanks folks.