In testing MLF on our site, I'm finding that the captcha image is not showing. Looking around I see that the gd library must be running and that there is at least one ttf font in /modules/captcha/fonts/ and the Tahoma. I've even added a second .ttf to be sure, but the ALT "Please contact the forum administrator if you can't see this image" is showing.

The mathematical test is showing and working. What am I overlooking? thanx, sam

php info is here:
http://www.macusers.com/forum/g.php