P: View > Fit Artboard on Screen is disabled
When working with layers within artboards Fit Artboard on Screen command in View menu is disabled and assigned keyboard shortcut doesn't work. To get it work you only need to actively select artboard, which is completely inconvenient and annoying. I guess the app may clearly 'know' that currently selected layer is within a particular artboard, so Fit Artboard on Screen can be successfully applied to the artboard that contains currently selected layer.
Let me know if any more details are needed. 
