You may experience a error in the latest version of Chrome. When mousing over the menus you sometimes can’t access the sub-menus. This appears to be a chrome only fault as I have tested IE9, Firefox & Opera and the error doesn’t occur. The latest version of Chrome is 20.0.1132.57 m
I have asked tech support to investigate and will post any results here. Should you experience this intermittent fault please let me know and include the browser version of Chrome you were using.