This typically happens because a page is trying to open in a new window, and the pop-up blocker is not allowing it to open. To disable your pop-up blocker in Internet Explorer, follow these steps: 

1. Click on Tools
2. Hover over Pop-up Blocker
3. Click Pop-up Blocker Settings
4. Under Address or Website to Allow, type www.kintera.com
5. Click Add
6. Under Address or Website to Allow, type *.blackbaud.com
7. Click Add