Sound (and occasionally video) disappears in VSE

Question

newbie here.

I was editing together some clips in the VSE. All was apparently well, but coming back it this evening, I find that only two strips are audible and only a few visible. I can't think what I might have done by accident to cause such a thing. If it helps, the audible strips are soundtrack strips which I added last. No apparent rhyme or reason to the invisible video strips. I am running Blender 2.77 on Linux.

Help would be much appreciated if you have any thoughts. Can you think what I might check to fix the problem?

You most likely have moved the footage to a different location than it was before when you imported it? — Samoth, Aug 22 '16 at 22:06
Brilliant guess - that was exactly the problem. Happy to accept this as an answer if you want to write it up. — Mark C., Aug 23 '16 at 19:21
Possible duplicate of Preview and rendered video from VSE suddenly shows nothing — Samoth, Aug 24 '16 at 14:34

score 1 · Accepted Answer · answered Aug 24 '16 at 14:33

When you can't see/hear strips content any more it's usually due to moved footage location. When Blender can't access the originally imported footage anymore it will just show black/play nothing even the strips remain in place and will work again once the footage is back in its original location or once you refreshed each affected single strips source.

Sound (and occasionally video) disappears in VSE

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