Blank white screen

Hi guys, I hope I don't annoy with noob questions of someone who does not know what he is doing.

1. When the app starts on my phone, the screen is just blank white. Is this intentional? Do I have to switch back to the Pokemon Go App?
2. When running the App, nothing on my mac happens. There is no window showing the map and the arrows and all. Did I forget to do something?

Love and thanks in advance,

M