So I just got Hitfilm 4 Express on my Mac. reason I'm just getting it now was because this was a problem before so I just left it.
So the problem is basically the viewer window is zoomed in on the bottom left! I hit scale to fit and I make sure the clips controls are centered and nothing (I'd upload a screenshot but IDK how to insert a picture onto this so I'll explain the best I can) I think what's happening is say you cut a rectangle into some paper than you took a picture and wanted to put it under the paper but its too big to see the whole thing. I think thats what it is doing because if I try to center it with the mouse and render it than its all messed up in the render.
its like even the checkered back round is zoomed in! does anybody know a fix for this and also if you show me how to upload a screenshot in here I will. I just can't figure it out i click the photo button yeah thats the end of where I can understand whats going on!