Insert MathType Equation is disabled in Numbers I am running Numbers 3.1. When I try to select the Insert > MathType Equation... option, it is disabled.

There doesn't seem to be anything in the help related to this feature.

How can I use this menu option?
You might want to make sure the MathType application is running before you invoke the Insert > MathType Equation option. I read about it here and tested it on a Mavericks Mac at work a few minutes ago.