I opened a family tree by clicking on its .gramps file. The tree opens properly and I am able to edit, save changes, etc. However, when I click on the "Family Trees" button or select "Manage Family Trees" from the menu, the resulting dialog box is empty. 

This is preventing me from archiving my tree.

I'm on Gramps 3.4.2-1 OS:Darwin.

Thanks,
Mitch