Known issue (and solution) with client-side validation
As discussed in some previous threads, an issue was discovered in Validation Toolkit 2 that prevented the Client-side Required validation from working properly when applied to a select list or a radio group.
We are now offering steps to fix this issue in the Download Center of our website. (Log in / visit downloadcenter.php.) Click on either Validation Toolkit 2, or under the Suite you purchased that contains this extension; then click on the Known Issues section.
We are currently working on a dot release that will contain this fix and will release it as soon as possible. Thank you to the users who helped us discover this issue and for your patience while we prepared the fix.