Yes, you already think you know the answer looking at the topic title, but perhaps it's not the obvious one!
Raspbian Jessie, with current updates. gpsd installed and working from the default serial port. Almost.
When first booting the RPi gpsd does /not/ autostart in spite of "-n" being present in the options. This used to work under Wheezy.
So I enter: "sudo service gpsd restart" and gpsd is then running as normal. I guess I'm missing something obvious, but what? Any thoughts about what the problem might be, and how to proceed with further diagnosis?
Thanks!