We use Captchas on our registration page. Since today the Captcha images are broken. But what’s strange is that some times it does work. If I look in my /images/captchas/ directory I can see that most of the images in there are 0 Kb, but some of them are 3 Kb. Maybe about 1 in every 10 is there. If I refresh the registration page over and over again then occasionally I will see the captcha image, but most times it’s broken.
I have checked all the usual things. Permissions on the folder are right, GD library is installed, PHP memory limit is set to 64Mb, path to captcha directory is correct and it’s a full path, ...
What could be the problem? Has anyone else had this before?