This is kind of a repost of an earlier error, but that one is marked as fixed, so I figured it is best to make a new one, since there seems to still be some bug here.

In move 198 I do the following:
1) click the double spade power action - this works as expected, various hexes get a blue ring

2) click on the carpet flight stronghold to activate it - this works as expected, hexes reachable by carpet flight get a blue ring

3) click on the yellow hex in the middle of the map (only available by carpet flight) - this works, I am asked how I want to transform it

4) I click on the red color indicating a transformation from yellow to red - HERE IS THE ERROR: nothing happens after I click the red color

I then tried to refresh the page and do the following:
1) click on carpet flight
2) click on action double spade
3) click on the yellow hex in the middle of the map
4) transform it to red
This Works! So it seems the bug only occurs if you click on the spade first, then on the flight.

So there is a workaround, but I think it is best of both lines would work, or if only one line works stop the other way of doing it at an earlier point, e.g. not allowed to click Carpet Flight after clicking on a spade action, should always click carpet flight first if you want to use it

I have also experienced this.

Fixed with today's release.