[Phpwiki-talk] Captcha problem

[Grant W. P. <gp...@ao...>]

What does it mean when the captcha image fails to show up; only the 
alternate text 'captcha' is displayed?  I assume it involves a failure by 
'?action=captcha' to successfully generate an image, but why?

The follow is the relevant source from the displayed page:

   <img src="?action=captcha&id=1151522916" alt="captcha" /><br/>
   <label for="edit:captcha_input">Type word above: </label><input 
type="text" class="wikitext" id="edit:captcha_input" 
name="edit[captcha_input]" size="10" maxlength="256" /></div>