Thanks for the bug report, I forgot to remove the default module from SVN.
I had someone look at the Pligg and they made a change to the CaptchaSecurityImages.php thinking they were fixing a problem with Linux computability, but it seems they broke it altogether. Easy fix is to change
Code:
realpath($this->font)
To:
This occurs on lines 61 and 64.
I will make the change to the SVN right now.
In the future please post bug fixes to
Pligg Projects.