You can use this page to test the Theme's handling of the shortcode, including the columns parameter, from 1 to 9 columns. Themes are only required to support the default setting (3 columns), so this page is entirely optional. One Column Two Columns Three Columns Four Columns Five Columns Six Columns Seven Columns Eight Columns Nine Columns
[wpvideo tFnqC9XQ w=680] VideoPress, especially as a video post format, usually provides some unique styling issues. You will need to install Jetpack or Slim Jetpack plugin to turn the shortcode into a viewable video.