At times, if your "zoom" setting in Excel is set to something other than 100%, such as when you are zooming in on a particular area of the CompanyCube for demonstration purposes, this will affect the sizing of the buttons on the Navigation and Help tabs.   You may also experience this when using the CompanyCube on a Virtual Machine at less than "full screen."

To remedy this, set your VM to "full screen" or change your zoom properties in Excel back to 100%