Running these from SSH one by one should work;

for CPAccess in `ls -A /var/cpanel/users`; do chown -R $CPAccess:$CPAccess /home/$CPAccess; done

for CPAccess in `ls -A /var/cpanel/users`; do chown -R $CPAccess:mail /home/$CPAccess/etc /home/$CPAccess/mail; done

for CPAccess in `ls -A /var/cpanel/users`; do chown -R $CPAccess:nobody /home/$CPAccess/public_html; done

/scripts/chownpublichtmls

Depending on how you're setup you might need these:

find /home*/*/public_html -type d -perm 0777 -exec chmod 755 {} \;
find /home*/*/public_html -type f -perm 0666 -exec chmod 644 {} \;

To take care of one users account this may be all you need.

chown -R usernamehere:usernamehere /home/user/public_html/* ;

Don't run any of them if you're unsure what you're doing.