Freehand mask tool missing

Hi,

In the drop down menu for mask tools, I only have four options.  The freehand "brush" mask tool which is usually on the bottom of the list is not one of them.  I have this same version of CDx7 on my desktop and the tool is present there, but not on my laptop.

Any thoughts or suggestions?

Thanks.

*** UPDATE ***

I found it.  

The little "+" icon at the bottom of the left side toolbar opens a drop down menu that allows you to select/deselect the available mask tools.