Re-open the project. At this stage you’d expect “Unity” to be enabled, but it isn’t.
In the code I see that buildUnity isn’t listed with all the rest in getLegacyPluginFormatIdentifiers. And I wonder what makes all the other formats legacy? Do I sense a new plugin format coming from ROLI?
I’m able to reproduce on the latest dev tip. The trick here is to be loading a project saved on an older Projucer build, in other words
Make a new project using the current master build of the Projucer (or use an old project)
Enable Unity and save the project using the develop branch Projucer
Close and re-open that project - Unity won’t be enabled (unless you add it to the list of legacy plug-in identifiers in Project::getLegacyPluginFormatIdentifiers)