[Inf-IT DAVcl] Loading problem

Using CalDAVzap 0.10.0.4 Start Google Chrome with CalDAVzap - displays April in the month view. Click [ > ] - displays May in the month view. Click [ > ] - displays June in the month view. Click [ > ] - disables the window and shows a message "Reloading ..." At this point, it seems to be stuck. The javascript console reads: Uncaught ReferenceError: tzName is not defined interface.js:996 Any idea what I'm doing wrong? -- Johan