Version 0.57 on Android 6.0.1 on Samsung A5 2017.
So, many people probably know about the "Doing cleanup" bug which essentially makes the loading of a colony impossible. Here is my case:
I realised it has something to do with the fact that I just set my save to online mode because I wanted to see how the board of trade works. That did not work because of some other issue (it said that no contracts are available until the interface bugged completely) and after a restart of the app, I got the infinite loading. I could still use the left menu, which I used to snag a photo with the built-in photo tool:
You can already see how the issue is that the loading screen simply will not disappear, not letting the player see what is he doing. I used the left side menu to try to get into the statistics menu where I could disable online mode. The statistics menu was behind the loading screen as well, but I knew the exact location of the online mode button and I switched it. I restarted the game and it instantly worked properly.