Is the other mod built on a version of Zencart earlier than v1.3.8? I have had issues in the past with Order based mods that rewrite the core orders.php file. Ones not based on v1.3.8 do not use the observer/notifier system so they never call the Reward Point functions.
To check, download the RPD (ftp://ftp.omnicia.com/rpd.zip) and extract the two files to the root of your store. Run this under your browser by typing "www.MY_STORE_ADDRESS.com/rpd.php" and check the final section (Special Rules Check). You should see the following:
Special Rules Check
Found ->notify('NOTIFY_ORDER_DURING_CREATE_ADDED_ORDER_HEADER' in includes/classes/order.php
Found ->notify('NOTIFY_MODULE_CREATE_ACCOUNT_ADDED_ in includes/modules/create_account.php
Found ->notify('NOTIFY_LOGIN_SUCCESS'); in includes/modules/pages/login/header_php.php
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