It was an issue with the form action on the optiongroups_results.php page.
If you want a blank action from a plugin, you need to remove the action entirely from the form tag. I did that and the page seems to work now.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.