I have Aperture and had some images in a project inside an aplibrary. I wanted to move some of those images out of Project A into Project B so selected them and tried to click and drag but they would not go. Project B in the projects list on the L would not become highlighted and th eones I wanted to move out wouldn't move.
I made a new Project and did a click/drag to move them to it [Project C] - but instead of doing that, it copied the images into that project, did not move them.
This hasn't happened to me before so I'd appreciate any explanation. I'm runnign the up to date Aperture, on Lion, and have no other problems.
Victoria, are you sure, you are moving between projects and not between other library items like albums, books, slideshows?
Only between projects will the images move. Dragging to an album will look like creating a new copy.
When dragging between projects the images will (should) only be copied, if you are holding down the options-key (or if has become stuck).
If you are really trying to move from a project and it does not succeed, then something may be wrong with your library. Try to fix your Aperture library with the First Aid Tools:
I'd suggest to make a backup of the library first.