My goal is to have the subscription run every weekday, every 30 minutes, from 7am to 6pm.
Thus, I tried to set it up using this cron expression:
0 0/30 7-18 ? * MON-FRI *
It ran yesterday just fine, but then stopped. This is what I see on the subscriptions page:

It seems weird that the "next send" is set for yesterday?
If I open this and re-save it, then it will work for a day, but then stop working again.
I'm not sure why this only works for a day, then stops.
Thanks,
Nathan