Hi again Marvel,
Okay, I checked out your two solutions.
1. There is an area called "Preview" if I click on the object in the list. This lets me toggle the object visibility yes. But if I leave the Scene View and go to another section of the editor, for example the Character section, and then come back to the Scene View the items will have disappeared again until I click on them. Sometimes they disappear when I click on other items in the same scene too.
See my attached screenshot. First shows the object when it is selected, second shows when i have left the scene view and then came back into it.
2. CTRL + Drag works (Not shift), thanks!

This is the first time I have used Visionaire Studio, so please feel free to stop me if this is some sort of "feature", but whenever I add an object to a scene (Let's say a red ball)... If I click off the ball in the object list (on the left) the ball disappears. It's not until I click back on the ball in the list, and then click the "Place Image" button or "Set Object Points" button that the ball will re-appear in the scene.
Another issue I am having is the following. Once an object has been placed on a scene, and vertices have been defined for its "active" area. If that object is then moved, can the vertices for that object move with it? At the minute, they stay where they were, so you have to delete them and do them all over again. This isn't bad for simple objects, but for complex shapes it's a nightmare.
Cheers