So to understand what you are saying when a customer signs up for an account on your site you are giving them 100 Reward Points but they are not transferring from pending to earned correct.? I have tested this on my site v1.5.0 and it works like it should. Maybe uploading the admin files again will solve the problem you are having. Make sure you check the files to make sure the right filesize uploads correct to your server. Different file sizes will cause problems. Check to make sure the admin/includes/functions/extra_functions/reward_points_functions.php uploaded correct. I would make sure I have the latest update of
Reward Points then upload all admin files again to be on the safe side.