First things i would check:
- Is the analysis service running properly?
- Are values sent to the PI Point when using backfilling?
Are all analyses behaving this way or only a single analysis? If it's a single analysis, can you post it's configuration here?Do you get results if you change the scheduling?
An important distinction to make is that when you click "evaluate" in PI System Explorer, the calculation is being done by PI System Explorer and not the Analysis Service using your credentials and not the service account running the PI Analysis Service.