Importing mp4 into storyline 2 issues

When importing (via the insert tab) a mp4 video, all I see is a 1 pixel wide line. I can then stretch it to fill the space but I would expect the file to fill the space.

For anyone's information, the properties of the file are 16:9, 1080p 50fps approx size 1meg.

Anyone's thoughts would be gratefully appreciated.

 

Lawrence

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