It seems that Pan & Zoom is cropping layers by 1 pixel...
1) Start new project
2) Add a bright red color clip
3) Drag onto Video 2 layer
4) Insert a jpeg (or other media) that is exactly the frame size (1280 x 720 in my case)
5) Drag onto Video 1 layer
At this point, the red background does not show anywhere. http://gothicawakening.com/graphics/kdenlive/kdenlive-panzoom-bug-1.png
6) Add "Pan & Zoom" to media on Video 1, do not change any values
Now you can see a line of 1 pixel red on the right and bottom edges of the media. http://gothicawakening.com/graphics/kdenlive/kdenlive-panzoom-bug-2.png
Note: Since many of the bugs I found in 0.8 didn't seem to happen for other people, I'm posting bugs here as well as Mantis, as I think more people look here. Would be great if someone could verify these are also happening on their setup.