PlugIn: JetPack

I was having a problem using the Display WordPress Posts widget and was advised to disconnect JetPack from both sites and reconnect. However, I now can’t reconnect to one of the sites. I successfully reconnected to http://www.stuartbruce.eu, but http://www.stuartbruce.biz just hangs on a blank screen after I’ve clicked authorize.

This is the URL of the blank screen

http://stuartbruce.biz/site/wp-admin/admin.php?page=jetpack&action=authorize&_wpnonce=9cb23506e6&code=nhZQehTqHL&state=6