I have been trying to use imagemodeler. I have followed all the instructions but I am
still getting the problem i had yesterday. Namely, I have 9 green locators. I have chose
the cube primitive. The cube icon has added itself to the left hand object file but there is NO cube in the picture anywhere ?

Hello Mark,
 
  That probably means that IM3 has not calibrated the shots.
Some indications to help:
- try to add more markers (calibration locators).
- verify the positions of the markers (select each marker and use ctrl+right arrow to cycle through the images and check the marker's position)
- create all markers in the calibration step (not in modelisation step; they do not help calibration)
 
Stef

There is an annoying feature in ImageModeller that if your world scale and coordinates are setup in certain ways, your Image Screen Depth needs to be increased before you can see your object.  Your object is behind your image!!
 
You can unlock your view and look at the box and you will see it is in your scene.
 
Just go to the properties of the image in that viewport and increase it's screen depth.  To see the changes you may have to cycle lock view on/off!!

i've tried to increase screen depth but the primitive cube still not show