Layers Dashboard not appearing

I accidentally exited the Layers Dashboard last night and I can't get it back. I've tried uninstalling / reinstalling, repairing twice, right clicking on the black window but nothing works.

I've even tried opening the .smx file again and again and this hasn't achieved anything either.

Is there a way around this? I've attached a screenshot of the problem. I'm hoping someone's had this issue before.

There's no menu options either (File, Edit etc.)