I don't know why it happens sometimes and not others, but I suspect that some settings are kept only until the gantt pane is shown by the grid -- and then if some item hours (taskactend-start) don't match with the "non working hours" being set in the management dialog, settings are erased.
In any case, it's only one of the problems linked to the grid management window (like : some changes don't stick when they are made in the grid management dialog and the modified grid is opened in the background). All these need too be sorted out as they are super time consuming.
Some confirmation for these grid management dialog problems should be confirmed.
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