Built a coal mine with my last building license.
Upgraded the mine once. No problem.
Upgraded the mine a second time. But time didn't the upgrade process start visually*. Also, the produced coal which it normally doesn't during the upgrade process. Pressed the upgrade button several times, but no gain.
I then refreshed the webpage to see if I could see the upgrade process.
When I came back is the mine gone but the resourses is back to 3000. But the building license didn't return. I also lost the tools from the first upgrade.
What to do to get the lost building license back?
*I have experienced the upgrade process started in the background even though there are no visual feedback. Probably due to slow connetion/lag. After refreshing the webpage is the upgrade process visual and then can it be at 60% or what ever it is at.