On Monday, 1/22/2018, I created numerous segments for our website. As of 1/25/2018, they're still not populating. Typically, it has taken up to 48 hours for the segment analytics to become available.
Do you use browser triggered or cron triggered archiving?
When reports are not shown, even though live data is recorded, check if either browser archiving is activated or the cronjob is running successfully.