Good tips and info here on kaps. Also useful for weather fax kaps.
Is this info in user manual advanced charts? It shold be!
Who will write it up and add to wiki?
.... Select the group then zoomed out, chart disappears, click on left hand blue rectangle on the bottom of the screen - chart appears. ...
.. but zooming the chart dissappears, and you need to click the blue rectangle again.
This is a phenomenon that has nothing to do with kap charts. It takes place even with other types of charts.