When I import a video file (the format seems irrelevant; I've used many), the video doesn't work. On the timeline, the video appears as a red square with text that reads "(Media Offline)", and the video preview is just black.
When I export the video, I get the same as the preview; a pure-black screen.
The audio works just fine, the video is the only problem here.
My computer is a Windows 7, 64 bit, if that helps.