@DarkPaladinUHC yup, If you correctly chmodded the files there's one more step (that's not instructed currently), and that's to switch the files group over to the php user.
This will most likely fix the issue.
sudo chgrp -R www-data /var/www/html/beta/forum
If that doesn't fix it, please post the output of this command below so we can see what we're looking at
ls -l /var/www/html/beta/forum