Comments not working

I’ve just found out that the comments feature on my blog isn’t working. I don’t know if this is just because I switched to Cave in June, but I have searched the WordPress.org support forums for similar issues with comments on blogs. Currently, if one tries to post a comment to one of my posts, once you hit the “post comment” button, you get a 404 error and a message that says, “You tried going to http://www.shootwithpersonality.com/wp-comments-post.php, which doesn’t exist, so that means I probably broke something.” I looked on my root directory, and that file IS there. I put a copy of wp-comments-post.php in my cave folder, and I still get the 404 error message saying that file doesn’t exist. I tried a solution I saw a lot when I searched the WordPress.org forums, by changing my Permalink settings back to default. When trying to submit a comment after this change was made, I got an error that said “Not acceptable. An appropriate representation of the requested resource /wp-comments-post.php could not be found on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.”

Any idea what might be going on? Thanks so much in advance…