However, the software is no longer being developed, as far as I can see, and has the limitations of PHP (memory). It works well for small datasets, but I am having a problem with larger datasets possibly due to server configurations beyond my control.
There is a user level fix, I discover.
Add something like:
php_value memory_limit 64M
to a relevant ".htaccess" file.
This may be problem with some versions of PHP, perhaps 4.2.2 or 4.3.3..
Gordo