Really odd issue.
If I add an event to the calender, load calender page (or sidebar) it shows new event and time is correct. Then if you reload the page it is shown minus one hour. The only way to reset this is to de-activate/activate the plugin. Then you still only get to see it right once before an hour is lost again.
I have this plugin running on another site on the same server so it must be a config thing.
Any ideas please?