Variations Error & Shipping Issue

I get the following error message with some of my product variations:

“Warning: implode() [function.implode]: Invalid arguments passed in /home/content/41/10156241/html/wp-content/plugins/wp-e-commerce/wpsc-admin/includes/product-variation-list-table.class.php on line 210”

There seems to be no rhyme or reason to which variations have the error and which are successful. How can I resolve?

Also, the products with these variations have an issue with shipping. Even if I put in a shipping weight (I went through and bulk edited all of the variations to make sure), it defaults to the most expensive shipping weight, which is about $8 more than it should be. All the other products I’ve done the exact same way have been fine. Please help!

Thanks!

http://wordpress.org/extend/plugins/wp-e-commerce/