Hi - in Preferences > Display Modes > Rendered > Grid you can turn on Show world axis icon.
As for the issue with the sun, I’m not seeing that here. Can you make sure that you have the default settings for the display mode by using the Restore Defaults button in Preferences > Display Modes > Rendered.
Before you delete your PLIST I would go to Rhino Preferences and I’d take a look at your rendered settings in the display mode tab. Take a look at the screenshot and make sure you have scene lighting instead of default lighting. Also make sure that the option use lights in layers that are off is turned off.