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Could you please tell me what is the exact version of your Captivate?
Also what is your operating system and have you tested this on a new blank project with a new question pool?
Did you perhaps delete the Next button? You need that button during Review. If you do not like to have it visible during the Quiz itself, it is possible to drag it under the Clear button. Normally the clear button is higher in the stack, but if you really have deleted the Next button, perhaps you'll have to delete the Clear and re-add it to restore the normal priority.
Thanks you Lilybri and Shekthar for your answer !
This is exactly what happens, i was working on a template module create d by a colleague who had delete the Next button. When i try on a blak model i understand the issue and find the solution.