Table list in Custom Query section (New Question) does not load

Hi, whenever I log on to metabase, the table list in custom Query section does not load. I have to go to the Admin panel and sync the database schema each time to populate the table list. I have set the database syncing to hourly in scheduling section. I have two different installations of metabase, and both have the same issues. Does anyone know what could be causing this?

How have you deployed metabase? It needs to be running when the schedule time arrives.
If deployed and running all the times, have you checked the logs for any errors?