Lightroom 4.1 RC2 Windows 64 bit. I want to report a bug. If you open a video and then click the settings gear icon so that the expaned timeline shows where you can set start and stop points. If you click play the timeline vertical position indicator works correctly, now if you move the starting point (trim the beginning of the movie) now click the play button. The vertical position indicate won't move anymore, until you go click another movie and then come back to that movie. Seems like a bug to me.