toastyanorak on "Error 500 Not Resolving"

Hi,

I have a problem with the 500 Internal Server Error.
I changed something on my site (the grouped-content.php) and updated it, and then the site had the error. So then I went through the regular steps, and realized to change the file back to normal, but even with the file back to normal, I still have the error. :(
Also my site is theblackandwhite.net

Thanks