Custom Sidebars Pro pop up doesn't open

I installed Custom Sidebars but when I went to the Widgets page and clicked "Sidebar location" on the widget in the sidebar the pop up shows an rotating icon forever instead of opening. So I upgraded to Pro thinking that would fix it. It didn't. How do I make it work? I am using WordPress 3.9.1 running Moxie theme.
Also, I only ordered the 1 month plan but the WPMU Dev panel shows it is a monthly subscription. Do I need to cancel the subscription so it doesn't charge me monthly?
Thanks, Ann