Problem solved by deleting cache from:
…%User%\AppData\Local\Turbulenz\Boundless
…\Program Files (x86)\Steam\appcache\stats
…\Program Files (x86)\Steam\userdata
You just need to find “Boundless cache” in these folders, you could find the path to them inside %User%\AppData\Local\Turbulenz\Boundless\log.txt
It looks like something like this
…\Steam\userdata\242493662\324510\local\chunkcache
and here “…\Program Files (x86)\Steam\appcache\stats” I just deleted last saved file.