Hi Laurence, depending on the object "profile" you started out with, your original settings should re-appear after selecting that particular profile.
So the way this works is that whatever changes you make, it will immediately be updated and stored in an embedded database for the selected profile. If you started out by opening a file name starting with for instance "Jup", it will automatically select and apply the settings for Jupiter.
Those prefixes correspond to what filename Firecapture gives to the initial AVI/SER recording, provided that you selected the correct profile in firecapture ofcourse and did not change the profile defaults there.
If your image stack does not start with such a prefix (Ven, Jup, Sat etc) it will select the default which is the moon profile. But you can always change it by selecting the correct profile on top of the panel.