I'm not talking about the group or template editor though? Those open and work fine, I've added a template there just fine. It's just when selecting a planet, I can't apply the template to it: as far as I know, it should look like this:
Reduced 91%Original 267 x 480
Is that from an older version of Galaxy Forge (its not on my galaxy forge either)? I don't think I've ever used that for adding templates. For universal templates like homeworlds, you need to make a new one in the GalaxySenarioDef file and then go to the group/template editor and then pick and add it from the drop down box on the left. For galaxy templates, go to edit, galaxy templates, make your template, then add it like a universal template. If that still doesn't solve your problem, what are you trying to do? That way I can at least give you a way to do it.