As a test for using SDK I created a very small airport in a field. Everything was working fine with the previous version and this airport was referenced in Content Manager. Before installing 188.8.131.52 I deleted all links in Community folder. After installing the new version I created again all links but even if the airport test is present in Content Manager the corresponding airport is not available on the world map as it was the case previously.
I guess I missed something.
Thank you for comments.
PS My small airport is now again available. Why ? I did nothing and I guess I will never have the answer.