Hello Jfwg, hello Firilla,
This is a bug that was discovered just after the release of version 4.2. This has nothing to do with a virus or Trojean. You are not alone in experiencing this problem. In France
, there are many who raises too.
BDBCAT has implemented a correction but this correction will only be effective when the next version of OpenCPN
The simplest, meanwhile, is to place the new waypoint routes near the old already existing waypoint, then closer, manually, new waypoints of old waypoints.