Memory Errors

I am running version 4 PHP opn RH 6.2 and have started trying to play with the php.ini file. I had a script which parses log files, highlights warnings and errors and then sends back to html and it has started giving error messages like the one below. Fatal error: Allowed memory size of 1024000 bytes exhausted (tried to allocate 421 bytes) in /home/httpd/html/index.php on line 105 I increased the "memory_limit" to around 10mb from the default 8mb but this does not seem to make a difference? What is strange is that when the script gives this message, it then comes up with any PHP page I try to load until a few minutes have passsed and I refresh the pages?? I have also been trying to send errors to a log file but after setting "error_reporting" and "Track_errors" on and giving a location and file in "error_log", I still dont get a log file created? Any help would really be appreciated. Thanks