It was noticed that some blogs throw exception:
Parse error: syntax error, unexpected $end in <server path to your blog>\wp-content\plugins\are-paypal\are-paypal.php on line 819
this is probably due to php.ini setting short_open_tag is set to Off.
version 1.7.1 is fixed to contain only <?php tags so it will probably solve the problem. Let me know if the erro reappears.