Recently the History view has stopped displaying the pane containing the commit message, commit SHA, parent, etc. Instead there's just the list of files in the commit. See screenshot — I've added a red ring where the commit info used to be.
I've searched the menus and prefs to find a way to re-display this. Unless I'm an idiot (which I don't think I am, with 29 years Mac development experience) it seems to be just gone. The release notes don't mention anything about this either.
Could this be a macOS Sierra (10.12) compatibility glitch? I'm on the latest beta.