Several in our alliance have noticed that when you open the map (small or full page) and start clicking around (ie clicking on oases to see the animals) after a while the map square information stops popping up. This can happen straight away or after any number of clicks.
The only way to fix it is to reload the page.
I am using Firefox latest version on WIndows 10 PC but other players are using different setups with the same bug.
This is on current UK2 AND UK3 servers