I have the same problem but it only happens when I import a clip to the timeline, audio on the clip still plays but where the video should be it says "Media Offline". However the clip fine when it is in the media storage preview. Please help
Most likely video format in unsupported. I think BM should stop letting file to be imported and showing as media offline. If video is unsupported file should fail to load, simple as this. So much confusion wit this offline state.