On line 93 of helper.php, change:
$query = substr($query, 0, strlen($query)-2);
$query = substr($query, 0, strlen($query)-1);
It's worth the effort though because this is a great looking component for displaying stock graphs on your site. Highly recommended.
I finally acquiesced and decided to risk the $45US since I needed the Virtue extension as well. I'm sure glad I did because this is one of the most complete, professional, well though out Joomla extensions that I've ever used. The administrative tools are well thought out and actually useful for determining how a given URL is being formed. There are configuration parameters for tweaking URL generation just about any way you want it. It even did a reasonable job for components that aren't supported by dedicated extensions.
Two thumbs up and well worth the price. Nice job guys.