i work at a secondary school and we are having an issue with this block on our moodle 2.2 installation

i can add students onto the site using the block but when it comes to adding groups to a course we cannot click on the 'ok' button. we were not sure if it was the javascript for the block so we downloaded the block again but again had no luck

does anyone have any ideas? or can you point my in the direction of the current programmer who's looking after this block?