[Plugin: Batch Cat] Doesn't work for 3.1

I have been using this great plugin to batch update the categories of my posts. But since upgrading to WP 3.1, this plugin no longer works. When I select the posts to update, I keep getting the error message :

“Please select at least one post !”

But I have selected at least one post to update but it doesn’t recognise it.

https://www.ads-software.com/extend/plugins/batch-cat/