Andrew, I am using this on zen cart 1.3.9b and these 2 errors are in the log at the moment:

PHP Code:
[04-May-2010 20:11:22] PHP Warning:  Invalid argument supplied for foreach() in /*/*/public_html/includes/functions/extra_functions/reward_points_functions.php on line 314
[04-May-2010 20:11:22] PHP Warning:  Invalid argument supplied for foreach() in /*/*/public_html/includes/functions/extra_functions/reward_points_functions.php on line 314 
and

PHP Code:
[04-May-2010 19:53:39] PHP Parse error:  syntax error, unexpected $end in /*/*/public_html/includes/functions/extra_functions/reward_points_functions.php on line 81