The main Relationship button (with the squiggly red arrow) is grayed out and can't be used. I've made sure I am not selected on anything and it still doesn't work. If I create a new tab the button functions again but not on my main tab. Very frustrated!
@Ned As I recall this, In MM2012 the behaviour you describe is as designed. The Central topic is always excluded from any actions. The Main topics however had all the action-options.
And MindManager is basically Object Oriented designed. For people like us this means Do-it To-it.
So you always select a topic before you can use any action on that. So If you want to use a relationship. select the topic where the relation starts first. Next slect the releationship icon and keep your mouse pressed. Move the line indicator to the new topic and release the mousekey.
That is the normal procedure.
NOW in MM2019 you can use relationships also between the central topic and any other topic. And you don't have to select a topic first. This maybe another reason tu upgrade??? ;-)