Hi, I've upgraded to the latest version of the plugin but then the admin page was blank.
Then I upgraded to WordPress 3.3 but nothing changed.
So, for now the only solution was to delete the plugin so that everything could work fine but I hope a new version will solve the problem and allow to use the plugin again.
Edit: it seems that there's a conflict with SABRE plugin.
[ Please do not bump, that's not permitted here. ]