slugs behaving strangly

Hey all,
I'm building a network for instructional designers in wyoming at http://wyoelearning.org and having some strange things going on with links. On the home page, if you click the icon for the welcome group (the little sock man, it'll change, but it's fun for now) it just reloads the home page. But if you go to Community >> Groups, then click on it, you can go to the group.

Likewise, the Events link in the main menu, just reloads the page.

I'm lost on this one, any thoughts would be much appreciated,
~ Aaron