Unless the publisher id of the actual image is set, the saving really does nothing. Please check the publisher id of that FreeDOS ISO image at "Extras/Image information". If its value is empty, there is an easy workaround. Please set an arbitrary (but non-empty) value at "Extras/Set publisher id" and check the saving functionality again. Please let me know if my "theory" solves your problem, because I'm about to create a patch (in Gentoo).
Unless the publisher id of the actual image is set, the saving really does nothing. Please check the publisher id of that FreeDOS ISO image at "Extras/Image information". If its value is empty, there is an easy workaround. Please set an arbitrary (but non-empty) value at "Extras/Set publisher id" and check the saving functionality again. Please let me know if my "theory" solves your problem, because I'm about to create a patch (in Gentoo).