Kreig you probably need to update the URL for the armory. Blizzard changed it about 3 or 4 weeks back. To do that go into your admincp, expand the Plugins & Products category, then click Plugin Manager and scroll down till you find the "Add signups to Event Description" plugin. Click the edit link next to that plugin and then search for armory.worldofwarcraft.com in the plugin code and change it to
www.wowarmory.com. If you are on an EU server, you'll need to change armory.wow-europe.com to whatever URL they ended up settling on for the EU folks. I dont know what it is offhand since Im on a US server.
That should fix the problem you showed in the second attachment.