redering: "save current preset" is overwritting original one.
i think that when using the "save current preset as new custom preset" the predefined name of the rendering profile nees to be automatically changed ( for example from MP4-H264/AAC to MP4-H264/AAC-Custom ) to prevent "destruction" of an original preset.
or maybe there is a bug that NOT SHOWS both of them.
Also "delete" is not working right now.