How somebody can make 100 comments on my site in 10 seconds ?!
If you have allow all visitors to post comments on your pictures then this could be automated spam. One way of stopping that is to only allow registered users to post comments. And you can always install the Captcha plugin just to be sure.
Captcha plugin. Use it. See if that works.
*sigh* Why do so many people expect to be spoonfed ? It's a forum and like any decent forum it has a [drumroll] SEARCH [/drumroll] function in the menu. Use it. Search for "Captcha plugin" or go here http://forum.coppermine-gallery.net/index.php/board,66.0.html (http://forum.coppermine-gallery.net/index.php/board,66.0.html)