I am a novice at PHP programming so I could be wrong about this, but line 21 of the readme file says:
[videopress xyz] uses your default theme content_width if present, otherwise uses 400px as width.
However I can't find anywhere in the plugin code where the content_width is set to 400px. This has caused me a problem because my default theme doesn't make use of content_width. For the time being, I am using the workaround that has been described here:
Also I can't get any of the height and width short code attributes to work either.