Switch Tracking off and apply noise reduction. You will now see what all the "signal evolution Tracking" fuss is about, as StarTools seems to know exactly where the noise exists in your image, snuffing it out.
In the Auto mask generator, set the parameters you need to generate your mask.
In this case the Super Structure module can be used to isolate objects in an image and lift them from an otherwise noisy background.
StarTools stores the masks you used in your workflow in the StarTools.log file itself.
Stacking artefacts are the most common dark anomalies located at the edges of your image.
You can convert everything you see to a format you find convenient. Give it a try!