Thanks for checking Mark. I can't figure it out. That file is definitely in that directory, with Permissions 644. I can see it in CPanel and in my FTP client. I deleted it, downloaded from your website again, edited the script, uploaded it to that directory, and I still get a 404 error. That is the only PHP file in that directory. All the other files are jpg, png, or html, and each of them will open up, but when I try to open the sunplot in a browser tab it can't find it. I even got desperate and tried clearing cache and rebooting. Hahaha. It's got something to do with looking for a PHP file that's somehow different that everything else it can find. I'll keep thinking, but I'm just about out of ideas.