GPS Waypoint database missing

The GPS waypoint database no longer appears in the GNS530. How do I get it back?

Up until a couple of days ago, the default GNS530 was working fine with waypoints being present and selectable when I planned a flight in the GNS530. But now, when I insert a route/plan into the GNS530, the airport codes can be inserted but none of the waypoints come up - as if the GNS530 cannot find the waypoints. I’m not using Navigraph or any similar add-on, just the default Asobo system. I might have inadvertantly caused this issue - the other day I noticed in my Content Manager that the GARMIN GNS 430/530 BY WORKING TITLE SIMULATIONS was not installed so I installed it. When I later did a flight I noticed that waypoints could not be inserted into the GNS530 - so I uninstalled that ‘addon’ but the lack of waypoints is still there. I’ve tried different GA aircraft but the issue is in each of them.

Any idea how I can get my waypoint database back again?

Thanks
John