When adding or editing external devices I don't get the "Send MIDI Clock" checkbox, so I'm unable to send the clock to my Nord Lead 4. It's the same regardless what device I check, though. I had the issue in Studio One 4 Artist. I've just installed Studio One 5 Professional where my issue remains. Is there anything I have to do for the options to show up?
In the answer to this question you can see the options I'm after.
Here is what it looks for me: