Tag Manager bug unity 5.2.1F1

I want to add a tag to Unity, i go in tag->add Tag->size, I put for exemple 2 or 10 but when i accept the size go back to 0. So it’s impossible to add a tag to my game. someone else have seen this bug ?

Make sure the inspector is not in Debug mode.

In Unity 5.2.1f1, the Tags list in Tags & Layers don’t have a Size field that you can manipulate.