It may be too late for an answer, but I hope this can be helpful.
Have you tried checking the apache httpd.conf file? The mine contains the following lines:
LogLevel error
ErrorLog /app/logs/apache/error/my_log_file.log
CustomLog /app/logs/apache/access/my_log_file.log combined
These lines save the .htaccess configuration override, maybe this is also your case ...
Hoping to be of Service