Captivate6 1 second being added to the timeline

Hi all,

Our team is currently going back over some old Captivate 6 courses to change some content and we are finding that on save-reopen of some files causes an extra second has been added in the timeline on some slides. Also that some objects have moved to new locations in the timeline. This effectively makes all our hard work a waste of time as the slides no longer work as they were intended. Has anybody else had this issue if so did yo fix it at all?

Luke