Update Audio Captions - crashes Captivate 12.4 on Mac

Hi All – on Captivate 12.4 I do change the voice in a caption and initiate the audio update – that crashes / shuts down Captivate. Is the size of the project an issue? It tried within a single page in a different project the same – just 2 words as caption with voice – that worked…any ideas? on Mac...