Might anyone know why one specific port's Log files (or any port's log files) are no longer being generated? They were being generated just a few hours ago.

We have not touched any config files and wondered if someone may have come across this in the past.

is it possible that your log files have reached the max size?
what have you tried to find out how to correct the issue?

I have the same problem 

I would suggest checking the permissions
LogIn to your centoavacast server and check the permissions in /var/local/centovacast/var/log
rw-r--r--  1 centovacast root        750351 May  9 15:31 cc-web_access.log
rw-r--r--  1 centovacast root          9265 May  9 15:09 cc-web.log

those are the files permission on my log files which are accepting new entries.