I am trying to enable captcha on my contact us form. I donot get the image just the alt code. When i try to open the veriword.php file directly in the browser, I get the following error
"The image /veriword.php?rand=2345103452 cannot be displayed as it contains errors". Phpinfo shows that all the required GD libraries are installed
GD Support enabled
GD Version 2.0
FreeType Support enabled
FreeType Linkage with freetype
FreeType Version 2.4.2
I have same problem by migrating from hosting to server,
on modx 1.0.6 and newly versions, i just run new install on modx CMS and moving all snippets and etc... to fresh site, and have no problem, i think these problem comes from .htaccess or Apache server configuration... Magic Bug )
Try Remove internal modx messages like "the image cannot be displayed \n\n"!!! and see what if happend
Code-Byte Developer and Executive Producer
Use Any PHP Captcha, it think veriword just bad writed, see this (1.0.10)
return $im_text;
imagedestroy($im_text);
Code-Byte Developer and Executive Producer
I track and find this error, These Problem comes from manager/includes/config.inc.php in UTF-8, just Convert to UTF-8 W/O BOM

Cheers!
Code-Byte Developer and Executive Producer