Topic: Using Gopro at 120 fps - problem with frame advance

I would like to use a ribcage modified Gopro at 120 fps (1080) but there seems to be a problem with replay in Kinovea.  I can play the video with no problem but I can't move a paused video on one frame at a time.  A paused video will only move on after every fourth click of frame advance.  Has anybody also experienced this issue and if so do you know how to overcome it?