My first problem is related to my preview window. It doesn't match my output at all. This means if I put any kind of visuals on top of my videos and animated them to move they do not appear where my preview window says and I have to guess where these objects may need to be and render and render multiple times until I get it right. Can someone explain to me exactly how to get my preview settings to match my render setting so when I edit I know what my finished prduct is going to look like before I render?

My second problem is related to a video I just published ( You'll notice when I fade between two video files (first instance at 6:01) there is a screen flash...why is that and how do I fix it?