I have come across something that I'm at a loss to understand whether it is my inexperience or a bug.
When layering video clips with composite transitions I found that the composite transition was colouring the video ever so slightly green.
I have a test example here: http://img442.imageshack.us/img442/7240/kdenlivegreencomposite.png that shows six concurrent pure white colour strips with composite transitions, and as the monitor window shows, the composite strips have stacked up to create a distinctive green hue.
This has affected a video I am working on which consists largely of two strips in split-screen with white backgrounds, and in some cases several layers with the three top layers being arrows pointing at various locations on-screen. This tinges the video a noticeable hue of green.
Is this a bug, or have I made a noob mistake?