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i installed your guestbook and enabled the captcha but it wont show. Instead it just says "Captcha Image" where the captcha should be. I have libgd installed so that should not be the problem:
GD Support enabled
GD Version bundled (2.0.34 compatible)
GIF Read Support enabled
GIF Create Support enabled
PNG Support enabled
libPNG Version 1.2.27
WBMP Support enabled
XBM Support enabled
the links in the source of the page also look correct: