Hello. I started going through the "Styling and Visualization" Developers Lab that was suggested by an email I received the other day (see attachment). I made it to Step 10 where the lab had me change the Admin0 forest or park/label/Default layer visibility zoom range number to 3. When I did so, the map went blank. I tried to increase the visibility number back to 5, but this didn't make the map visible again. I restarted the lab a second time and the same thing happened again. I'm wondering if anyone else has had this problem and if this is perhaps a bug?