just an idea but...

I noticed the Calender nav bar button isn't like the rest and I suggest removing it..
here is how you do that.
go to.. Display>Color>CSS Stylesheet
go to bottom of the CSS stylesheet, and put the following code in

Code:

a.mainmenu[href="/calendar.forum"] {display:none;}

this should hide the Calender nav button. if it doesn't I will try and give you another code.

Done