AA -
In your php.ini (for PHP5.2.1+) your memory limit should be set at least to 128M
; Maximum amount of memory a script may consume
memory_limit = 128M
Your server really should be running on at least PHP 5.2.1 - for major stability and security enhancements
for more information, visit
http://php.net/releases/5_2_1.phpin PHP 5.2.0, the default was "16M"
prior to PHP 5.2.0, the default was "8M"
for more information, visit
http://php.net/memory-limit