A jigsaw puzzle in dreams suggests a spiritual conundrum, a difficult problem to be solved.
Psychological / emotional perspective: A jigsaw tool is capable of cutting around shapes. It is this interpretation which may be relevant in dreams, we are able to circumvent a difficulty.
Material aspects: To see a jigsaw puzzle in dreams represents a mental challenge or a problem in waking life that needs to be solved.
If there are pieces missing in the puzzle, then it suggests that we do not have all the facts in order to make a considered decision.
If the pieces do not fit we may be at odds with a given way of working.