When meshing in Salome you can edit the mesh in the first window and then edit the Hypothesis constriction settings. If you close the Edit mesh window by hitting ‘x’ in the top right of the window while editing the Hypothesis Construction, it will close. After it closes you cannot open the meshing options anymore from the object browser on your current file. You have to restart the program and start from the last save.
thanks for the description of the issue, that we could reproduce on our side as well.
Regards.