On a macOS double clicking on an existing epub will not close Sigil if it is already running. You are probably launching a different version of Sigil someplace when you do that!
Sigil remains running when you close the Window (even the last window) and you can see this by looking for the dot in the panel under your Sigil app. If you click once on the panel Sigil with the icon, you should see the top menubar show Sigil and have a File menu enabled to open a new epub.
Dragging a new epub to that Sigil icon in the panel with the dot under it will just open a new Window in the existing version of Sigil just as using the File->Open menu would do.
Quote:
Originally Posted by Vroni
1) i'm double clicking on an existing epub, closing the "empty" instance
6) i double clck a new/different epub
Ohm, i do not have an initial startup tone.. when should that be?
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When you restart your mac, you should be hearing a startup tone indicated it passed its initial checks (assuming you have not turned your volume all the way down). If you do not, that indicates a system level problem. You might want to zap your parameter ram if this is the case to reset it to macOS norm.