Can you please zoom out and check if at least the world map (white for land, blue for oceans) is loaded. Also, what Android version is on that device?
the device has Android 9 – at that time the world map was not loaded, even when i tried a few hours later.
I checked again this morning, so a couple of days later, and all maps were now visible – no problem with enabling or disabling the maps, everything fine so far.
No idea why that happend, but what i know is that i am very short with storage space on my tab active maybe this could be an issue? I would really like it if maps could be loaded onto an external memory.
Thankyou for your efforts and the good work, I am looking forward to the things that are still to come.