Hi,
on my i-MSCP machine with Ubuntu 14.04 i've found a problem
The problem i think is related to the restart / reload function implemented by the PHP5-FPM service
When i modify the disable_functions in i-MSCP client or admin panel and apply, apache return error 500. In command line appears that not all php-fpm are stopped correctly and a php5-fpm restart / stop / reload get the "unknow instance" error. I must to kill all the related PID and start php5-fpm
Here the launchpad bug https://bugs.launchpad.net/ubuntu/+source/php5/+bug/1242376
Thank you very much