Hello Thomas,
Are you creating the marker in the Model view or in the Photo view mode?
If you update PhotoScan to the version 1.5.1 (called Metashape now), you would have two options in Photo view:
- Add Marker that creates a new instance and "blue" projections on every image, where from the manually specified point is located,
- Place Marker -> New Marker - also creates a new marker instance, but only with the single projection on the given photo. Other projections should be placed manually.