I guess I have a bug with a drag and drop exercice in my captivate file. When I give the good answer and click on the "validate" button all the proposals come back to their initial place and I'm not able to go to the "Good Answer" slide.
Have you set up the D&D as a scored slide or a Knowledge Check slide? Bu the 'validate' button you mean the embedded Submit button which is added automatically? How did you set up the correct answer, the attempts and the actions for the D&D slide? Can you insert a screenshot of the Drag&Drop panel?