So, is this only a playback issue? If you’ve recorded the tracks then I’d check the project’s media pool to make sure the audio files are present. I’m very new to Cubase, so can only offer the obvious suggestion to reset the Audio driver and see if the problem persists. Perhaps also try saving the project under a new name in a new directory just to refresh things. Sounds troubling and could be cause for summary judgment if someone’s important takes were just “gone.” heh
