Hello,
After you switch to suPHP/FastCGI for a website, please run the following commands from his Document root (for cPanel):
1. find ! -user username
2. find ! -user username -exec chown
username:username {} \;
3. find -type d ! -perm 755 -exec ls -ald {} \;
4. find -type d ! -perm 755 -exec chmod 755 {} \;
5. find -type f ! -perm 644 -exec ls -al {} \;
6. find -type f ! -perm 644 -exec chmod 644 {} \;
Thank you,