No video playing in canvas or on monitor but audio is fine

I was setting chapters markers on the timeline for DVD export and somehow hit the wrong key so when I play the video on the timeline, the audio is fine and is heard on my monitor but the video doesn't appear in the canvas (black only showing) and shows only the first frame of the particular clip on my monitor. I checked video external settings and it is set to 'all frames'.
Any ideas how I screwed this up. It's in the settings as I went back to an autosaved version from 5 minutes previous and the same problem.
thanks for any assistance.

The key, btw, is w.
Patrick

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