I noticed this problem myself and saw other people reporting it on the main Wordpress plugin site. Here it is: on line 2991 of wassup.php of Wassup 1.6.2, there is the code:
<? } //end if geoip_map
But there should be:
<?php } //end if geoip_map
Because without it, some servers will report an unexpected $end at the end of the file, for obvious reasons. I posted this solution in the relevant thread at the Wordpress page and I expect you'll include the fix in 1.6.3.
Good going on an awesome plugin, greetings,
Grismar.