After arranging videos and start / stopping them with the visible option I saved the file as a project. After reopening the project it stops working, i.e.the videos are starting from the beginning of the timeline!
When deleting the video and putting it back, it works until I save and close the project.
This bug can be replicated with .avi and .wmf files.
We would need, as it is in iClone, a ridged state channel to definitely set start / stop points.