Re: error after new post (all of a sudden)
How about configuring custom logging temporarily, just to be sure you are seeing the logged errors?
http://us3.php.net/set_error_handler
I think the delay in posting is not due to server load but due to this 500 error. It’s thinking about something then it fails.
If the script had a syntax error, I would think it would fail more quickly. You can check all your php scripts for syntax errors if you have command line access if you do something like this:
shell# find . -name "*.php" -print| xargs -n1 php -l
(that’s “dash n one” and “php dash el”, lowercase L)
Looks like you’re on CentOS so that should work OK.