So, I've been able to reproduce the problem. For this, closing/restarting kstars hsn't been enough.
If :
- reboot my computer
- start kstars
- open Ekos and connect simulators
- add a new sequence without changing the pre-filled "Directory" parameter
- start the sequence

then, Ekos is not incrementing the frame index in filename.

As soon as I open the browser UI of the "Directory" param, no problem anymore (even if I restart kstars, this is why I suspect a link with OSX app permissions)

Anthony

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