Exchange update won't install

In Ai CC 2014 (subscriber), when I try to open the Exchange Panel, the panel opens and tells me to click Update for the latest features. When I do that, it asks if it's OK to run the Extension Manager. When I click OK, it then spins the wait icon forever.

I've reinstalled Ai CC 2014, and I've run the Extension Manager manually, and everything appears to work, but this update process for the Exchange Panel never completes, so I can't access the Exchange.

Any help would be most appreciated.

Allen