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Answers

I installed High Sierra. The names of children disappeared.

This is an issue introduced by macOS High Sierra.

We resolved the issue in the 11.0.12 update, which is a free maintenance update for all Reunion 11 users. It can be downloaded here.

Another option is upgrading to our current version, Reunion 13. (The issue doesn't affect Reunion 13). Information about Reunion 13 and how to purchase an upgrade to Reunion 13 can be found here.