Hi there,
If the videos on one computer are choppy but not on other, then it can be an issue with the Display driver.
Please check this Help file link: http://help.adobe.com/en_US/captivate/cp/using/WS5b3ccc516d4fbf351e63e 3d119e9582a67-7fe5.html
http://help.adobe.com/en_US/captivate/cp/using/WS5b3ccc516d4fbf351e63e 3d119e9582a67-7ffb.html
Thanks.