In the editor, if the only changes applied to a map are a change of sampleset for individual hitobjects, the changes are not saved upon testing or exiting unless you save manually.
Not much else to say, let me know if I need to elaborate.
osu! version: 20130926 (latest)
Not much else to say, let me know if I need to elaborate.
osu! version: 20130926 (latest)