Paypal plugin does not work

I just purchased the paypal plugin and it does not appear to function at all. I'm running in sandbox mode just to try it, and after many failures, I have looked at the code.

In paypaypal.php:

        $s_info = jcsPPGetInfo($params, $post, $default);

Which is later used to look for results and info:

        switch($s_info['txn_type'])

However, jcsPPGetInfo returns either TRUE or FALSE, not an array, so the results from paypal are never handled at all.

Do I have a bad version of the plugin?